On Sat, Dec 24, 2011 at 5:35 AM, Arnold Krille <arnold AT arnoldarts DOT de> 
wrote:
> Well, actually the comparison is done against the last backup of a lower 
> level.

Actually actually <g> from my understanding their isn't any difference
at all in BackupPC's filesystem between the two if it hasn't been
modified. In fact you can't even say that one instance of the file is
"in" the last full backup as opposed to "in" the incremental sets. The
only think that is "in" those sets is the hardlink, which even at the
underlying OS level, are identical structures, with no distinction to
one being the "master" as you would have say with symlinks.

Now in the case of a file having been modified since the last full, of
course then the two are different, and of course it only makes sense
to compare to the newest one, since in BPCs storage model there isn't
any benefit to distinguish between "incremental" vs "differential"
sets.

I seem to recall this may be an issue however with non-rsync
transports, since I never use them I don't know.


Confirmation of the above would be appreciated; I think not
understanding these issues is a source of confusion for newcomers to
BPC used to thinking in terms defined by traditional backup software
regimes.

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