KVM Virtual Machine Backup

I’m using very simple way to back up my virtual machines:

1. I create a snapshot of my lvm volume where I keep images

2. Mount the snapshot

3. I tar all my images and copy them to other server

4. Umount and remove the snapshot

I have created a backup script that is run everyday by cron:

DATE=`date +%Y%m%d%H`
#Create the snapshot
/usr/sbin/lvcreate --snapshot --name snap --size 30GB /dev/VolGroup00/LogVol02
/bin/mount /dev/VolGroup00/snap /snapshot
#archive machines
tar -zcf /backup_snap/VM1.${DATE}.tgz /snapshot/VM1.img
tar -zcf /backup_snap/VM2.${DATE}.tgz /snapshot/VM2.img
/bin/umount /snapshot
#remove snapshot
/usr/sbin/lvremove -f /dev/VolGroup00/snap

/backup_snap is mounted NFS share from my backup server where I keep my backups ( in other building of course :))

Here is fstab line for /backup_snap /backup_snap nfs defaults,soft 0 0

I use “soft” option in case if the share was unreachable so it wouldn’t block my server from booting up

Problem is that everyday I need to copy all images through network but i thing that only some bytes of information change in my image files. I’m looking for a solution that synchronizes files on byte level in linux, does anybody know something like that?


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