Steve M. Robbins wrote at about 22:19:44 -0500 on Monday, October 24, 2011:
 > Hi,
 > 
 > One thing that all these methods have in common is that they scan the 
 > entire pool filesystem.  I accept that I will have to do that at
 > least initially.  However, to send daily updates, it seems unnecessary
 > to re-scan the filesytem again when backuppc itself already computes the
 > information needed:
 > 
 > * the set of files added to the pool
 > * the set of hardlinks in __TOPDIR__/pc/$host/$backup
 > * the set of files expired
 > 
 > It strikes me that backuppc could be taught to write all this out to
 > one or more journal files that could be replayed on the remote system
 > after the new files are transferred.
 > 
 > Does this make sense?  Has anyone investigated this approach?

I and others have considered such approaches before.  The problem is
that this would require modifying the BckupPC program itself to record
such journals. You also left out pool chain renumbering which is a
consequence of file/pool expiry.

Most of us have been reluctant to modify BackupPC other than to
diagnose/fix bugs because the program itself is both quite stable and
critical. So, the inclination has been to do things outside of
BackupPC to avoid unintended consequences that could potentially
destabilize the program. Additionally, this would in a sense 'fork'
backuppc itself unless Craig would buy into such changes.

Also, the v4.x version that Craig is working will reportedly make a
lot of these archive issues  moot.

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