Toni Van Remortel wrote:
Nils Breunese (Lemonbit) wrote:Toni Van Remortel wrote:How can I reduce bandwidth usage for full backups?Even when using rsync, BackupPC does transfer all data on a full backup,and not only the modified files since the last incremental or full.That's not true. Only modifications are transfered over the network when using rsync. Full backups are just more thoroughly checking whether files have changed (not just comparing timestamps, but actually checking the contents of the files).Then I wonder what gets transferred. If I monitor a full dump, the bandwidth usage is way much higher than when I copy it manually. If a simple 'rsync -auv' takes 2 hours to complete against a backup from 1 day ago, they why does BackupPC take 2 days for the same action? I'm out of ideas, and hacks.
It might be because BackupPC doesn't run the equivalent of rsync -auv. See $Conf{RsyncArgs} in your config.pl for the options used and remember rsync is talking to BackupPC's rsync interface, not a stock rsync. There's much more going on: the compression, the checksumming, the pooling, the nightly jobs (if your backup job really needs two days then it probably gets in the way of the nightly jobs), that's all not happening when you run a plain rsync -auv. The traffic shouldn't be much higher though (after the initial backup of course), I think.
Could you give us some numbers? How much traffic are you seeing for a BackupPC backup compared to a 'plain rsync'?
Nils Breunese.P.S. You might want to check out rdiff-backup (http://www.nongnu.org/rdiff-backup/ ) if you're looking for an rsync style incremental backup tool and don't need the compression, pooling, rotation and web interface that BackupPC gets you out of the box.
PGP.sig
Description: This is a digitally signed message part
------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
