[clue-admin] Backups

[David L. Anselmi]

Jeff Cann wrote:
[...]
> I thought rsync only sends changed / different files.  So after the first 
> 'full' backup of 75 MB, the next rsync would only send diffs.  I'm not sure 
> that rsync only sends changed blocks.  Plus rsync can compress on the fly...

Yes, changed/different files.  We currently make a new tar file every 
week.  It's currently 75MB.  So rsyncing every week won't re-transfer 
the old tar files but it sends the new one entirely, 75MB.

I think we can do better by using something other than tar files to hold 
the backup.  But I haven't yet figured out a way to explain the 
difference between tar and rdiff-backup that makes the performance 
difference obvious.  And I may be missing something (overhead other than 
network I/O, gzip compression vs. block sharing, etc.) that makes me wrong.

Dave
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