Re: [BackupPC-users] How to backup a laptop over internet

[Xuo]

Hi,

Thank you for the explanations, even though I think I've understood 
about 10% of what you wrote ;-)
I understand it's not easy to implement each request any user can ask 
for. So don't worry.
I've started working on this vpn connection without knowing exactly what 
I could use it for, but I see that little by little, it will become more 
and more useful.
I'm still working on it and when I'll have better understood how it 
works, I'll re-read all these posts.


Regards.

Xuo.


Le 30/05/2017 à 21:18, Holger Parplies a écrit :

Hi,

Xuo wrote on 2017-05-30 19:03:03 +0200 [Re: [BackupPC-users] How to backup a 
laptop over internet]:

I'm using BackupPC 3.3.0 (got from the Web gui).
Yes this feature would be really great (at least for me !!).

sorry, really busy, two quick remarks:
Can't be too difficult to backport "this feature" (context = array argument
to ClientNameAlias possible) to 3.3.0. Supposing I find the time before
someone else does, I'd look at it ...


Thank you to all for your help. I'm still fighting with the vpn
connection. I'll tell you if I succeed (one day) to backup through
this f... vpn connection.
vpn + nice feature => king of the world.

You *can* use a VPN locally, too. That way, you'd be reachable via the same
address in both cases (plus a local one if you're on the local net; probably
faster for non-BackupPC traffic). Routing might be a little tricky. You'd
probably need to NAT to the VPN gateway address for connections from the LAN
to your notebook (via the VPN address) - something along the lines of

   iptables -t nat -A POSTROUTING -o tun0 -d 1.2.3.4 -j SNAT --to-source 1.2.3.1

(replace tun0 with the VPN device name, 1.2.3.4 with the notebook VPN address
and 1.2.3.1 with the VPN gateway VPN address). You'll also need to prevent
routing to your local subnet via the VPN when you're on the local subnet
(which OpenVPN with "push route ..." would do, for instance).

Or you could DNAT connections to the VPN address to the local address when
the VPN isn't connected (that's a DNAT in PREROUTING *and* an SNAT in
POSTROUTING, because you need to catch the return packets).

Requires some networking skills and possibly some experimentation, but it
can definitely be done. The ClientNameAddress variant is easier to implement
without doubt, but the VPN variant is more generic, i.e. it doesn't require
 to be able to handle multiple addresses.

If you need help with routing or firewall rules, feel free to contact me
off-list (hopefully, my MTA will behave ...), and I'll try to respond soon.

Regards,
Holger

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Re: [BackupPC-users] How to backup a laptop over internet

[Holger Parplies]

Hi,

Les Mikesell wrote on 2017-05-30 14:38:46 -0500 [Re: [BackupPC-users] How to 
backup a laptop over internet]:
> On Tue, May 30, 2017 at 2:18 PM, Holger Parplies <wb...@parplies.de> wrote:
> >
> > You *can* use a VPN locally, too. That way, you'd be reachable via the same
> > address in both cases (plus a local one if you're on the local net; probably
> > faster for non-BackupPC traffic). Routing might be a little tricky.
> 
> If the VPN is configured as point-to-point with the other end on the
> backuppc server, routing would take care of itself via the subnet
> masks.

true enough. If that works for you, do it like that.

> [...] The routing is only complicated if the endpoint is on a router or some
> other device.

Unfortunately, that is probably the normal case, the point being remote
connections via the internet. You won't *usually* have your BackupPC server
on your firewall (or router, if you don't have a firewall), though there
might be instances where you do.

Well, you could port-forward the VPN traffic from your router/firewall to the
BackupPC server. If you're only using the VPN for BackupPC, that doesn't
sound unreasonable. If, however, you're using it for general access to your
home network, well, you're basically back to "running the BackupPC server
on your firewall", even if it might not look like it ...

Regards,
Holger

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Re: [BackupPC-users] How to backup a laptop over internet

[Les Mikesell]

On Tue, May 30, 2017 at 2:18 PM, Holger Parplies  wrote:
>
> You *can* use a VPN locally, too. That way, you'd be reachable via the same
> address in both cases (plus a local one if you're on the local net; probably
> faster for non-BackupPC traffic). Routing might be a little tricky.

If the VPN is configured as point-to-point with the other end on the
backuppc server, routing would take care of itself via the subnet
masks.  The backuppc server could always use the tunnel address with
just a little bit of extra overhead when the laptop is on the LAN.
The routing is only complicated if the endpoint is on a router or some
other device.

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Re: [BackupPC-users] How to backup a laptop over internet

[Holger Parplies]

Hi,

Xuo wrote on 2017-05-30 19:03:03 +0200 [Re: [BackupPC-users] How to backup a 
laptop over internet]:
> I'm using BackupPC 3.3.0 (got from the Web gui).
> Yes this feature would be really great (at least for me !!).

sorry, really busy, two quick remarks:
Can't be too difficult to backport "this feature" (context = array argument
to ClientNameAlias possible) to 3.3.0. Supposing I find the time before
someone else does, I'd look at it ...

> Thank you to all for your help. I'm still fighting with the vpn
> connection. I'll tell you if I succeed (one day) to backup through
> this f... vpn connection.
> vpn + nice feature => king of the world.

You *can* use a VPN locally, too. That way, you'd be reachable via the same
address in both cases (plus a local one if you're on the local net; probably
faster for non-BackupPC traffic). Routing might be a little tricky. You'd
probably need to NAT to the VPN gateway address for connections from the LAN
to your notebook (via the VPN address) - something along the lines of

  iptables -t nat -A POSTROUTING -o tun0 -d 1.2.3.4 -j SNAT --to-source 1.2.3.1

(replace tun0 with the VPN device name, 1.2.3.4 with the notebook VPN address
and 1.2.3.1 with the VPN gateway VPN address). You'll also need to prevent
routing to your local subnet via the VPN when you're on the local subnet
(which OpenVPN with "push route ..." would do, for instance).

Or you could DNAT connections to the VPN address to the local address when
the VPN isn't connected (that's a DNAT in PREROUTING *and* an SNAT in
POSTROUTING, because you need to catch the return packets).

Requires some networking skills and possibly some experimentation, but it
can definitely be done. The ClientNameAddress variant is easier to implement
without doubt, but the VPN variant is more generic, i.e. it doesn't require
 to be able to handle multiple addresses.

If you need help with routing or firewall rules, feel free to contact me
off-list (hopefully, my MTA will behave ...), and I'll try to respond soon.

Regards,
Holger

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Re: [BackupPC-users] How to backup a laptop over internet

[Xuo]

Hi,

I'm using BackupPC 3.3.0 (got from the Web gui).
Yes this feature would be really great (at least for me !!).
Thank you to all for your help. I'm still fighting with the vpn 
connection. I'll tell you if I succeed (one day) to backup through this 
f... vpn connection.

vpn + nice feature => king of the world.

Regards.

Xuo.

Le 30/05/2017 à 01:30, B a écrit :

On Tue, 30 May 2017 09:13:14 +1000
Adam Goryachev  wrote:


Wasn't there a recent extension to ClientNameAlias which allows
multiple addresses to be used, which will be tried (in order), and the
first found would run the backup?

Duno, Adam, I'm still in v.3 for production use and no time to explore
v.4 (is it now rock-stable ?); this might change when Debian Stretch
will become the new stable (around mid june ?), but I must see about
solid version migration before any change can take place.


This seems a perfect use case for that, adding the local IP and the
remote IP as the two aliases, hence only a single "host" in backuppc,
consistent ordered backups all in one place.

This is really a nice feature, especially in this case.


PS, this probably only applies to BPC4.x and I forget what version the
OP is using.

He did not state it, just that he use mageia5, which, from their site
is a fork of mandriva - might work the same as rh: one click and it
installs a hexabyte "package" with no other choice *<;-{p)

Jean-Yves

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Re: [BackupPC-users] How to backup a laptop over internet

[Bzzzz]

On Tue, 30 May 2017 09:13:14 +1000
Adam Goryachev  wrote:

> Wasn't there a recent extension to ClientNameAlias which allows
> multiple addresses to be used, which will be tried (in order), and the
> first found would run the backup?

Duno, Adam, I'm still in v.3 for production use and no time to explore
v.4 (is it now rock-stable ?); this might change when Debian Stretch
will become the new stable (around mid june ?), but I must see about
solid version migration before any change can take place.

> This seems a perfect use case for that, adding the local IP and the 
> remote IP as the two aliases, hence only a single "host" in backuppc, 
> consistent ordered backups all in one place.

This is really a nice feature, especially in this case.

> PS, this probably only applies to BPC4.x and I forget what version the 
> OP is using.

He did not state it, just that he use mageia5, which, from their site
is a fork of mandriva - might work the same as rh: one click and it
installs a hexabyte "package" with no other choice *<;-{p)

Jean-Yves

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Re: [BackupPC-users] How to backup a laptop over internet

[Adam Goryachev]

On 30/05/17 05:33, B wrote:

On Mon, 29 May 2017 20:56:01 +0200
Xuo  wrote:


Hi,

Hi Xuo,


My pc is running Mageia5.
I don't understand how a VPN connection could help solving my problem.
Could you please explain more in details ?

A VPN means either a roadwarrior (your itinerant laptop) can connect and
benefit from all machines of your LAN, or connect 2 LANs together (eg:
enterprise branches.)

This means, when you're connected to it, that your backuppc server can
reach your laptop in a secure mode (encrypted and possibly compressed
mode) as easily as if it was connected on the LAN @home.

As formerly said and because of the VPN nature (no same IP segment
messing), you'll be obliged to create 2 accounts on the server:

one with the DNS laptop name for LAN connections -
ie: mylaptop.zatiluvsomuch, let's say it == 192.168.0.25,
 (or directly 192.168.0.25 if you do not have a home DNS),

and one based on the (fixed !) VPN IP address you use when away from home
ie: 172.16.0.25.

Provided you backup daily @2000 AND your laptop is always connected at
this time whether you're home or away:

192.168.0.25 will be saved if you're @home,

172.16.0.25 will be saved when you're away from home,
Wasn't there a recent extension to ClientNameAlias which allows multiple 
addresses to be used, which will be tried (in order), and the first 
found would run the backup?
This seems a perfect use case for that, adding the local IP and the 
remote IP as the two aliases, hence only a single "host" in backuppc, 
consistent ordered backups all in one place.


PS, this probably only applies to BPC4.x and I forget what version the 
OP is using.


Regards,
Adam

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Re: [BackupPC-users] How to backup a laptop over internet

[Bzzzz]

On Mon, 29 May 2017 14:21:18 -0500
Les Mikesell  wrote:

Hi Les,

…
> to access the web interface.   A good starting point would be looking
> at point-to-point configurations of OpenVPN.You'll need either a
> stable IP address for your home network or at least something that
> will work with a dynamic DNS service.
 
Yup, I forgot this one !

Also note that using WireGuard instead of OpenVPN can give you an
uncommon speed (that OVPN could just dream of):

=== EXCERPT FROM WG ML (20170513)
Using the Infiniband network directly, iperf's performance is 21.7 Gbit/s
(iperf maxes out the CPU at the receiver, even when using 8 threads).

Hardware used:

- Xeon E5520 @2.27GHz (2 CPUs, 4 cores each)
- Mellanox ConnectX IB 4X QDR MT26428

Versions used:

- Debian jessie
- Linux 3.16.43-2
- Wireguard 0.0.20170421-2
- iperf 2.0.5
- Mellanox ConnectX InfiniBand driver v2.2-1
=== /EXCERPT FROM WG ML (20170513)

JY

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Re: [BackupPC-users] How to backup a laptop over internet

[Xuo]

Thank you for the explanations. I'm currently fighting setting up an 
openVpn connection.

I'll have a close look at your proposal.

Regards.

Xuo.

Le 29/05/2017 à 21:21, Les Mikesell a écrit :

On Mon, May 29, 2017 at 1:56 PM, Xuo  wrote:

Hi,
l
Thank you for the replies.
My pc is running Mageia5.
I don't understand how a VPN connection could help solving my problem. Could

Some VPNs (OpenVPN for example) can be configured to have a fixed
private IP address at the remote end, even though the connecting
public addresses will vary with your location.   If you set a
point-to-point tunnel VPN up on your laptop and your backuppc server
(or another host or the router on your home network) then backuppc can
be configured to use the end point address as its target, and if you
don't want to wait for a scheduled backup to run you can also use it
to access the web interface.   A good starting point would be looking
at point-to-point configurations of OpenVPN.You'll need either a
stable IP address for your home network or at least something that
will work with a dynamic DNS service.




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Re: [BackupPC-users] How to backup a laptop over internet

[Bzzzz]

On Mon, 29 May 2017 20:56:01 +0200
Xuo  wrote:

> Hi,

Hi Xuo,

> My pc is running Mageia5.
> I don't understand how a VPN connection could help solving my problem. 
> Could you please explain more in details ?

A VPN means either a roadwarrior (your itinerant laptop) can connect and
benefit from all machines of your LAN, or connect 2 LANs together (eg:
enterprise branches.)

This means, when you're connected to it, that your backuppc server can
reach your laptop in a secure mode (encrypted and possibly compressed
mode) as easily as if it was connected on the LAN @home.

As formerly said and because of the VPN nature (no same IP segment
messing), you'll be obliged to create 2 accounts on the server:

one with the DNS laptop name for LAN connections -  
ie: mylaptop.zatiluvsomuch, let's say it == 192.168.0.25,
(or directly 192.168.0.25 if you do not have a home DNS),

and one based on the (fixed !) VPN IP address you use when away from home
ie: 172.16.0.25.

Provided you backup daily @2000 AND your laptop is always connected at
this time whether you're home or away:

192.168.0.25 will be saved if you're @home,

172.16.0.25 will be saved when you're away from home,

nada will be saved, wherever you are, if you're not connected.
(although, there are rumors of the backuppc team working on a way to
backup data by telepathy, we can't give it much credits as it was issued
by the nsa - furthermore, this would imply you to read all files line by
line.)

To be short, VPN allowing a transparent connection, the only difference
with a pure LAN construction is the 2nd account needed.

> I understand the proposal from Johan Ehnberg setting 2 hosts, but I'd 
> prefer to avoid this.

You can't, or more likely, if you do so, you will enter the "dark side"
of routing (routing only part of the same IP segment), which is far from
easy, prone to (huge) errors and absolutely discouraged for beginners.
(but it can be a nice way to learn how to route correctly; if you choose
this way, make sure noting important gets out of your LAN.)

Jean-Yves

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Re: [BackupPC-users] How to backup a laptop over internet

[Les Mikesell]

On Mon, May 29, 2017 at 1:56 PM, Xuo  wrote:
> Hi,
> l
> Thank you for the replies.
> My pc is running Mageia5.
> I don't understand how a VPN connection could help solving my problem. Could

Some VPNs (OpenVPN for example) can be configured to have a fixed
private IP address at the remote end, even though the connecting
public addresses will vary with your location.   If you set a
point-to-point tunnel VPN up on your laptop and your backuppc server
(or another host or the router on your home network) then backuppc can
be configured to use the end point address as its target, and if you
don't want to wait for a scheduled backup to run you can also use it
to access the web interface.   A good starting point would be looking
at point-to-point configurations of OpenVPN.You'll need either a
stable IP address for your home network or at least something that
will work with a dynamic DNS service.

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Re: [BackupPC-users] How to backup a laptop over internet

[Bzzzz]

On Sun, 28 May 2017 21:21:32 +0200
B  wrote:

> And this won't work, even if you know by advance the IP where your
> laptop can be reached, unless you open a hole in the firewall &| adsl
> box/modem in the home that host you.

Forget about that, I was thinking about a very different thing; my bad.

JY

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Re: [BackupPC-users] How to backup a laptop over internet

[Bzzzz]

On Sun, 28 May 2017 20:50:55 +0200
Xuo  wrote:

> Le 22/051/2217 à 198.44, Xuo a écrit :
> > Hi,

Hi,

> > I am using BackupPC on my laptop when it is connected to my local 
> > network at home.
> > But, when I'm not at home (durin the work week), I don't know how to
> > do. I'm not in some hotels, ... but in another flat (that I rent),
> > where I have a static IP and where I could open some ports if
> > necessary (ssh, ...).

If you're under Linux, use a VPN, such as: https://www.wireguard.io/ ;
under m$, duno (& don't care very much.)

> > I think I could define my laptop ip (on my BackupPC server 
> > configuration) using my remote ip adress, but this wouldn't work
> > when I come back home.

This means you'll be obliged to reach your server through the VPN
connection when in a home-home configuration; so your VPN MUST be able
to connect like that and preferably not eating your CPU.

And this won't work, even if you know by advance the IP where your
laptop can be reached, unless you open a hole in the firewall &| adsl
box/modem in the home that host you.

> > What should I do to perform these backups from my server (located at 
> > home) to my laptop located either on my local network or remotely
> > (on internet).

Notice that if you usually backuppc@1600Z, you'd better already be
connected at this particular time, unless you wanna shift it.

Under m$, this should be the same, however it depends greatly on your
user's permissions & groups, which can be quite a PITA and depends
on your setup and user's type - notice m$ VPN almost all have large
security problems.

Other possibility: in case of breakdown, ask the nsa a copy taken from
their last incursion ;-p)

Jean-Yves

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Re: [BackupPC-users] How to backup a laptop over internet

[Johan Ehnberg]

Hi Xuo,

>> What should I do to perform these backups from my server (located at
>> home) to my laptop located either on my local network or remotely (on
>> internet).

There are many approaches:

- Dynamic DNS
- VPN
- Reverse tunnel
- Mirror files on server with rsync or unison, backup server instead
- Use a cloud storage system, backup the cloud storage instead

>> I'm not in some hotels, ... but in another flat (that I rent), where I
>> have a static IP and where I could open some ports if necessary (ssh,
>> ...).

Additionally, in your case, you could simply set up two hosts, one for 
when connected locally, one for remotely.


Best regards,
Johan Ehnberg

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[BackupPC-users] How to backup a laptop over internet

[Xuo]

Hi,

Nobody knows how to answer my question ?

Regards.

xuo.

Le 22/05/2017 à 19:44, Xuo a écrit :

Hi,
I am using BackupPC on my laptop when it is connected to my local 
network at home.

But, when I'm not at home (durin the work week), I don't know how to do.
I'm not in some hotels, ... but in another flat (that I rent), where I 
have a static IP and where I could open some ports if necessary (ssh, 
...).
I think I could define my laptop ip (on my BackupPC server 
configuration) using my remote ip adress, but this wouldn't work when 
I come back home.


What should I do to perform these backups from my server (located at 
home) to my laptop located either on my local network or remotely (on 
internet).


Regards.

Xuo.






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Re: [BackupPC-users] How to backup a laptop over internet

[Vladislav Kurz]

On 05/22/17 19:44, Xuo wrote:
> Hi,
> I am using BackupPC on my laptop when it is connected to my local 
> network at home.
> But, when I'm not at home (durin the work week), I don't know how to do.
> I'm not in some hotels, ... but in another flat (that I rent), where I 
> have a static IP and where I could open some ports if necessary (ssh, ...).
> I think I could define my laptop ip (on my BackupPC server 
> configuration) using my remote ip adress, but this wouldn't work when I 
> come back home.
> 
> What should I do to perform these backups from my server (located at 
> home) to my laptop located either on my local network or remotely (on 
> internet).

Hi Xuo,

you could connect home using VPN. If configured properly, you may even
get the same internal IP as when you are at home.

Or, you could set up some internal DNS at home, that will return two A
records for your computer - both home and work IP addresses. Backuppc
(Or any other software) will then try both of them to connect.

-- 
Best Regards
Vladislav Kurz

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[BackupPC-users] How to backup a laptop over internet

[Xuo]

Hi,
I am using BackupPC on my laptop when it is connected to my local 
network at home.
But, when I'm not at home (durin the work week), I don't know how to do.
I'm not in some hotels, ... but in another flat (that I rent), where I 
have a static IP and where I could open some ports if necessary (ssh, ...).
I think I could define my laptop ip (on my BackupPC server 
configuration) using my remote ip adress, but this wouldn't work when I 
come back home.

What should I do to perform these backups from my server (located at 
home) to my laptop located either on my local network or remotely (on 
internet).

Regards.

Xuo.




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