I must be missing something on this whole compression, pooling, and
checksum matter.

I found 2 files in my cpool that have the same checksum (one is _0)
but 'cmp' to different values. However, when I zcat them, they have
the same value. I thought that (lossless) compression was a 1-1
mapping?

But here we seem to have two files that are identical (and thus have
the same checksum) but compress to 2 *different* results?
This would seem to be going against the grain of pooling where two
identical files share the same pool entry.

What am I missing?
Does backuppc add some extra header information during compression? (I
didn't see anything obvious in FileZIO.pm).

Note all files were backed up with rsync/rsyncd.

Is there anywhere (other than the code) where this is more fully documented?

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