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fs block level syncing



Right now we do a lot of hard to hard disk backup by using rsync to weekly
"mirror" the source filesystem to a backup filesystem. This works fairly
well for most sources.  However, one issue with rsync is that simple things
like changing the file name or directory name cause the whole file or
directory structure to get recopied over a previous sync. Also, like for
mail spools, large files that simply get appended to get the whole file
recopied.

Does anyone know of something that syncs an ext2/3 fs to another
at the block level which result in less data transfer?

-- 
---------------------------------------------------------------
Paul Raines                   email: raines nmr mgh harvard edu
MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging
149 (2301) 13th Street        Charlestown, MA 02129	USA   






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