Rob Sheldon wrote at about 12:04:15 -0700 on Wednesday, May 11, 2011:
 >  On Wed, 11 May 2011 14:32:56 -0400, Jeffrey J. Kosowsky wrote:
 > 
 > > How big was your pool and pc tree?
 > 
 >  We currently have two BackupPC servers we work with -- one of them is 
 >  only about 20G of disk but is using a silly number of inodes (it's 
 >  backing up a maildir mail server, among other things), and I think the 
 >  other is around 3 or 4 TB of disk used at the moment. I don't remember 
 >  which one we had to move, it happened about a year ago. The best I can 
 >  recall is that we struggled with rsync for a week or so, then I found 
 >  out about tarpipes and that got the job done overnight.
 > 
 >  You're right though, on second look, it looks like rsync -a should work 
 >  just as well as tar. I'll have to do another BackupPC pool transfer in a 
 >  few days, and now I'm curious what (if any) difference there is between 
 >  tar and rsync, so I'll try both.
 > 

Note 'rsync -a' won't handle hard links correctly... you need the -H
flag... and that is what slows it down (and any other file-based copy method)

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