On 10/28/09, Chris Owen <chrisowen AT eigersecurities DOT com> wrote:
>
> Would like some advise on the best way to backup backuppc. I have a
> 1TB USB drive that I would like to copy all of our backups to. Has
> anyone done this? How easy is it to roll back from USB?
Hi Chris - I have a backup program in beta, HashBackup, that I've been
testing with BackupPC trees, and a few BackupPC users have tried it.
It runs on Linux, FreeBSD, PCBSD, and OSX (Mac). One guy backed up
his 500GB BPC tree with 31M files to a USB drive. It took about 25
hours, which isn't great, but it did work and could be restored (the
restore took 16 hours), whereas rsync would not back it up and
consumed gobs of memory trying.
The beta site is: http://sites.google.com/site/hashbackup
In the latest release there is a new option, --linktree, to backup
trees that are heavily hard-linked, like the BPC tree. (The backup
above did not use --linktree) In experiments on a simulated BPC tree
with 250K files, --linktree was 9x faster on ext3, 6x faster on xfs,
3x faster on jfs, and 30% faster on hfs (Mac). I don't yet know if
these speedup factors will hold on a really large BPC tree.
If anyone would like to try HashBackup, the options to backup a BPC tree are:
$ hb backup -c <target dir> --no-compress --no-dupcheck --linktree /var/backuppc
The --linktree option is still new, and I'd appreciate the opportunity
to work with anyone to optimize it for use on a real BackupPC tree.
HashBackup only opens your BackupPC files for reading of course.
Jim
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