Are the brackup targets compatible?

Ask Bjørn Hansen ask at
Thu Aug 13 01:14:27 UTC 2009

Hi everyone,

I'm converting an rsync/rsnapshot backup scheme to use rsnapshot to  
avoid the hassle/cost of moving files around (it's my Aperture Library  
+ raw photos backup).

I'm doing a brackup backup to a Filesystem target now on the "backup  
host" to convert the old backup to Brackup.   I'm planning to then  
change it to be backed up from the "real" host with the Sftp target.    
Will that work?  As far as I can tell from the code the chunkpath  
method is the same.  Anything else to look out for?

Three auxiliary questions:

1) Shouldn't we have a new release?  The verify script looks useful  
(to put it mildly).

2) I saw in the list archive that there were some (bad) gc bugs late  
last year -- were they all sorted out?

3) Is there a practical way to re-use chunks from different backup  
sources; or is that how it works by default? (Think backing up a bunch  
of different boxes; many files/chunks will be the same).  I was  
thinking of using rsnapshot (like we do now) to a central host and  
then 'brackup' that box; but that'd probably end up being too many  
files for brackup to efficiently handle.   (Our two rsnapshot backup  
servers are storing ~1.5TB each with about 22M inodes in use each).    
I guess the question is: How do you use brackup?

   - ask

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