In v4, I wanted to confirm that the following approach would work for
merging together backups for 2 different instances of backuppc.

For convenience, assume we are copying instance #1 onto instance #2

1. Copy over Cpool/pool
   Copy cpool/pool from instance #1 to instance #2 using 'cp -an' to
   avoid clobbering.
   I am willing to "assume" the very low risk of md5sum collisions --
   (which frankly exists even with rsync-bpc).


2. Copy over pc tree
   For non-overlapping machines, just copy over the machine.

   For machines existing on both instances, renumber before copying as
   necessary to avoid conflicting numbers (plus make sure that
   incremental/full and filled/unfilled chains are not interrupted)

3. Run 'BackupPC_fsck -f' to adjust refCnt's and poolCnt's


Any thoughts?
Any better ways?


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