Re: [BackupPC-users] Full vs. Incremental

[Les M. <les...@gm...>]

Stephen Vaughan wrote:
> What about with multiple full backups, say your full backup is 50gig and you
> do a full backup once a week, will mean each full backup will use 50gigs of
> space? Or does the pool do some other linking between the data contained in
> each full backup?

All files with exactly the same content are pooled together regardless 
of the source of the other matches.  The actual size requirement for a 
new full is somewhat unpredictable.  If you have large files that change 
even slightly (growing logs, unix mailboxes, database dumps, etc.), 
you'll get a new copy in the pool where unchanged files will be linked. 
The pooling check happens after the transfer, though. The comparison for 
changes to transfer with the rsync method works against the filenames in 
the prior full or full+incremental if you use incremental levels.  A 
growing logfile, for example, would have rsync send only the difference 
while the backuppc side reconstructs a full copy merged with the old 
content, then this new file would be added to the pool.

-- 
   Les Mikesell
    les...@gm...