On Wed, 6 Mar 2013 10:10:17 -0600 Les Mikesell <lesmikes...@gmail.com> wrote: > On Wed, Mar 6, 2013 at 9:56 AM, Maarten <m...@milieudefensie.nl> wrote: > >>> > >> Yes - the pool/cpool directory is full of extra hardlinks where the > >> hash of the content is the name to quickly match up new items > >> (plus a little extra work to deal with collisions). Rsync just > >> follows the existing pc directory tree though, so you do have to > >> copy the data from each new location once, but storage is all > >> pooled. If the target system is local, that usually isn't a > >> problem. If it is over a low-bandwidth connection it might be > >> worth some extra work to fake the initial tree with a copy of the > >> old link tree. > > > > OK, thanks for clarifying this. I feel silly that I have used > > BackupPC for years but never realized this. > > > > The bandwidth is not an issue, so I'm about to start a new full > > backup right away. > > I'm not sure how much temp space will be required for the initial run. > I think backuppc does something clever to handle matching small files > in memory to avoid any extra disk writes, but large ones may be saved > then subsequently replaced with links which might be a problem in an > extreme case.
Which might be a good opportunity to split one big server with one big backup-share into several "servers" with maybe even smaller shares. Then you can distribute full backups of that one machine onto several days. And the first full-backup doesn't need to transfer all files to the backup machine before deduplicating (which is the "link"-step in the status afaik). Have fun, Arnold
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