Compressed backup

jw schultz jw at
Fri May 24 14:45:01 EST 2002

On Wed, May 22, 2002 at 12:47:00PM -0700, Matthias Munnich wrote:
> Hi
> I am using rsync for backup on the disks of a Linux backup server.
> Obviously the server could store more data it the data were
> compressed. I read the "rsync -> tar" thread. Unfortunately, a 
> compressed file system for Linuthere does not seem to exist yet. 
> However, rsync can use compression for file transfer.
> Would it be possible to implement an option to store the data on the 
> backup server in the compressed chunks use for the file transfer?   
> It would save space and should also speedup a later rsynchronization. 

Despite what it's homepage says, from what i gather e2compr
is in active development and a fair number of people are
using it.  Try searching thre recent (last 8 weeks) lkml
archives to find out where it has moved.

If you are attempting compression in order to store multiple
backup "snapshots" take a look at linking them.  I do so
using an rsync patch (--link-dest) and on a fairly active
area get the same effect as 7:1 compression but without
actually compressing anything.  Less active trees will
require even less space.  The patch, as well as the Dirvish
backup system can be had at

	J.W. Schultz            Pegasystems Technologies
	email address:		jw at

		Remember Cernan and Schmitt

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