Holger writes:

> I like the idea of taking *any* identical file from the pool as reference
> though. I don't know if it is possible (i.e. whether the remote rsync will
> transfer one checksum covering the whole file before the local part needs to
> commit to selecting one file), but it certainly would be a worthwhile speedup.

It's not currently possible.  Rsync does have a --checksum option that
causes it to compute and send the file digest as part of the initial
file list.  That could allow BackupPC to try to use a file which is
a likely match.  However, rsync's and BackupPC's digests are different,
so getting the --checksum digest doesn't allow you to look up the file
in the pool.

It's possible BackupPCd could do something like this in the future.

Craig

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