2010/2/24 Agnello George <agnello.dsouza at gmail.com>: > > > On Wed, Feb 24, 2010 at 4:13 PM, Gavin Carr <gavin at openfusion.com.au> wrote: >> >> On Wed, Feb 24, 2010 at 10:38:32AM +0100, David Hrbáč wrote: >> > Dne 24.2.2010 10:00, Agnello George napsal(a): >> > > We have an issue with one of our clients , they have a mail server >> > > with >> > > the /var/spool/imap partition as 150 GB . They need to take >> > > differential >> > > backup on to /backup partition ( a different HDD of total 250 GB >> > > space ) . >> > > We have tried dar , rsync, rdiff and impasync . But its is not >> > > sufficing the >> > > need as to take a lot of time and consumes a lot of I/O . >> > > >> > > Is there any back up solution that you can think of , that can work in >> > > this >> > > situation - open source or proprietary >> > >> > Is seems to me, that you are using mbox format. So, differential backup >> > is hard to achieve. Migrate to maildir, every mail is a file, easy to >> > backup differentially. >> >> rsync and rdiff should handle mbox format okay though. Though I agree >> Maildir >> is generally nicer for differential backups. >> >> Agnello, how long is "a lot of time"? A backup is always going to have to >> walk >> the entire tree and checksum (or at least stat) every file, so there's a >> minimum >> cost you're always going to have. How long does a 'find /var/spool/imap >> -ls' >> take, for instance? >> >> You might want to try brackup (http://code.google.com/p/brackup/). For >> very >> large trees of relatively small files it seems to significantly >> out-perform >> rsync-based backups. I've got brackup packages in my repository (see >> http://www.openfusion.net/linux/openfusion_rpm_repository). >> >> Cheers, >> Gavin >> > is it possible with " brackup " to back it up to a different server on the > same lan instead of /backup . Is there any documentation on the same . rsync or rdiff-backup works on local disk or remote disk.(and other backup methods too!) -- Eero