2010/2/24 Agnello George <agnello.dsouza at gmail.com>: > > > On Wed, Feb 24, 2010 at 4:57 PM, Eero Volotinen <eero.volotinen at iki.fi> > wrote: >> >> 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!) Summary from webpage: "Flexible backup tool. Slices, dices, encrypts, and sprays across the net, notably to Amazon's S3. " -- Eero