[clue-admin] Backups

[David L. Anselmi]

Jed S. Baer wrote:
> We've talked a bit about backups at the admin meetings, and a suggestion
> was that perhaps a couple of people could implement offsite backups using
> rsync over ssh.

Looks like we currently do a full backup once a week running about 75MB 
(uncompressed).  (And the backup dir is getting full.)  So rsyncing that 
will be a 75MB transfer weekly (not a big deal but probably more than is 
necessary).

Something like rdiff-backup might be better for this, where only changed 
files are transferred and rsync can transfer only the changed blocks. 
(rdiff-backup can be used to both the backup dir and offsite dirs.) 
There's dervish too, but it's not in Debian so I haven't bothered.

I haven't quite thought it out completely but the 
full/differential/incremental (compressed) backup model may be obsolete 
when backing up to disk.  I should look to see if there are any papers 
out comparing performance.

Do we have docs on our current scheme?  It might be interesting to 
design something new and compare the pros and cons.

Dave
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