gregwm wrote at about 10:26:51 -0600 on Tuesday, February 22, 2011:
 > > rsync'ing the BackupPC data pool is generally recommended against. The
 > > number of hardlinks causes an explosive growth in memory consumption by
 > > rsync and while you may be able to get away with it if you have 20GB of
 > > data (depending on how much memory you have); you will likely run out of
 > > memory when your amount of data gets larger.
 > 
 > this issue sure comes up alot, and perhaps i should just keep quiet
 > since i personally am in no position to do it or even go off looking
 > for an rsync forum, nor do i have any knowledge of just how convoluted
 > the rsync source may be to try to look at, but as a naive outsider it
 > seems still it ought not to be such a task to have a go at the rsync
 > source and come out with a version that sorted its xferlist into
 > [filesystem:inode] order if preserving hardlinks, or possibly just
 > created a simple [filesystem:inode] index of files already transfered,
 > in replacement of whatever mangy hardlink table is in there now.
 > 

Well I wrote a perl script that does something quite similar:
- Creates a pool indexed by inode number
- Creates a list of hard links
- Rsync the pool itself (without -H)
- Recreate the hard links

Search the archives in the past few weeks for BackupPC_copyPcPool.pl

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