Hi I use backuppc to backup a few virtual machines, in my case I use a
snapshot feature from lvm to create a snaps and delete the snap after
the backup.
$Conf{DumpPostUserCmd} = '/usr/bin/sudo
/programas/scripts/backup_discos/borra_snap.sh';
$Conf{DumpPreUserCmd} = '/usr/bin/sudo
/programas/scripts/backup_discos/crea_snap.sh';
I use sudo to enable backuppc use the script using root
root@servidor:/etc/BackupPC/pc# cat
/programas/scripts/backup_discos/crea_snap.sh
#!/bin/bash
/sbin/lvcreate --size 4000m --snapshot --name BackupM /dev/vgdatos/lvdatos
check_ok=$?
if [ $check_ok != 0 ]; then
exit 2
fi
/bin/mount /datos/SnapshotM
check_ok=$?
if [ $check_ok != 0 ]; then
exit 2
fi
exit 0
Works very well with virtual machines.
I recomend reboot the virtual machines one at week at least to verify
for this machine was able to start without problems and not making any
backup broken.
If recover the backup (a few times this happend) the machine start
again on virtualbox without no problem.
Regards!
On 13/01/2023 11:06, lu lu wrote:
I explain to you.
I have various VMs and from those servers I only backup the data and
so it will remain for all the reasons you explained to me.
of a single VM, which is a windows10, there is software installed that
acts as a switchboard and has various installations to make it work
including java and various plug-ins which are not backed up so in case
of machine crash to install new the whole switchboard is crazy,
instead if I copied the whole VM in case of crash I recover everything
including the operating system
Il giorno gio 12 gen 2023 alle ore 14:32 G.W. Haywood via
BackupPC-users <backuppc-users@lists.sourceforge.net> ha scritto:
Hi there,
On Thu, 12 Jan 2023, lu lu wrote:
> > On Wed, 11 Jan 2023, G.W. Haywood wrote:
> > > On Wed, 11 Jan 2023, lu lu wrote:
> >
> > > ... is it possible with backuppc to backup a complete
virtual machine?
> > > ...
> >
> > Yes, but it's pointless. You may as well just make a copy.
> >
> > There are better ways to do what you want, for example you
might look
> > into snapshotting filesystems.
> >
> ...
> Can you explain better what you mean?
Read the documentation.
One of the most important features of BackupPC is its deduplication.
That means even if it keeps hundreds of backups, it need only keep one
copy of any particular file if the file hasn't changed from one backup
to the next.
If you backup an entire VM as a file it will always be different (from
minute to minute, let alone from backup to backup). Not only will the
BackupPC system not be able to deduplicate the file, it probably won't
be able even to complete a copy before the file has changed - so files
it tries to copy might not actually be usable. You might need to stop
the VM while the backup is taking place in order to get an internally
consistent, usable result.
Snapshotting filesystems 'freeze' an image of the filesystem at some
particular time but they permit that filesystem to continue working
normally. You can then copy any frozen files at your leisure, without
resorting to things like stopping your VMs during backups.
Backing up large databases for example may need similar consideration.
Why would you want to back up a complete VM anyway? It's usually much
better to have a template for the VM and then back up for example just
the user data, which will usually be tiny by comparison with a
full VM.
--
73,
Ged.
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