On Sun, 2011-03-06 at 23:02 +0700, Fajar A. Nugraha wrote: > On Sun, Mar 6, 2011 at 10:46 PM, Brian J. Murrell <br...@interlinx.bc.ca> > wrote: > > # cp -al /backup/previous-backup/ /backup/current-backup > > # rsync -aAHX ... --exclude /backup / /backup/current-backup > > > > The shortcoming of this of course is that it just takes 1 byte in a > > (possibly huge) file to require that the whole file be recopied to the > > backup. > > If you have snapshots anyway, why not : > - create a snapshot before each backup run > - use the same directory (e.g. just /backup), no need to "cp" anything > - add "--inplace" to rsync
To add a bit to this: if you *do not* use the --inplace option on rsync, rsync will rewrite the entire file, instead of updating the existing file! This of course negates some of the benefits of btrfs's COW support when doing incremental backups. -- Calvin Walton <calvin.wal...@kepstin.ca> -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
