On 08/11/2015 09:18 AM, Chris Murphy wrote:
On Tue, Aug 11, 2015 at 3:05 AM, Diogene Laerce <me_buss...@yahoo.fr> wrote:
https://wiki.archlinux.org/index.php/Full_System_Backup_with_rsync
Is there a trick I don't see here ? Because if the backup of those
directories
is enough for a full restoration of a system state, this method is far more
efficient than the others, isn't it ? As one does not need to reboot and
just have
to make a script or/and a cron job to make his own snapshot.
I don't consider a backup and snapshot to be the same thing. Copying
(or rsyncing) some directories to another volume is a backup. A
snapshot is a deduplicated copy of something at a particular moment in
time, on the same volume or storage pool. It's not a backup, in that
if the pool implodes both the original and snapshot are lost. A
snapshot can be used as a source for a backup, since you can make a
snapshot that doesn't change while the backup is happening.
I agree with Chris. Snapshots are ways of restoring data that has been
perhaps corrupted or deleted or going back in time to some earlier
point in the filesystems' life. They aren't backups.
Backup philosophies and techniques vary depending on what you need for
your unique situation. I'm not claiming what I do is the best, but this
is what works for me:
On the last Friday of a month, I plug in a big ESATA or USB3 drive and
use it to store the output of Mondo Rescue. I have the backup in the
form of DVD-sized ISO images I can burn DVDs from and there is a
recovery DVD you can boot from. That gives me a backup usable to
restore to bare metal.
Once a week (or more often if there's been significant changes), I use
a _different_ ESATA or USB3 drive and run an rsync that backs up
everything except a few things (/proc, /sys, /dev, /media,
/var/log/journal, various caches, etc.) to a directory on that external
drive based on the hostname and date I ran the backup. That permits me
to restore data that's a bit more recent than the MondoRescue stuff.
I'd be happy to share the MondoArchive and rsync scripts if you wish.
Tweak to suit your needs.
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