Hi all,
Can anyone please tell me which is the best opensource backup software which also supports mysql and incremental backup.

Thanks

There are threads about backup software already, for example see this (quite short one) here, which suggests rsync. If you mean you want to backup (mysql) databases, you can take a dump of them and store those dumps. Incremental backups are rather easy with rsync; I'd say unless you have a big, complex setup of systems, a small script with rsync, run via crontab, is all you need. There are probably commercial solutions as well, which do this and that, but I don't see how they're worth the price for home use. If you're not home, you can always persuade your superiors to give some money for a ready-to-eat solution

Rsync would also be opensource, if you insist on it.

p.s. "best" is something that you define in your own situation; it is simply not possible for someone to tell you that product X is the best for you. It can be, but only you know.

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Amanda and Bacula are the fully featured FOSS backup solutions. IDK Amanda. A Bacula job can be configured to run a script before starting the backup and this can be used to backup a MySQL database. Bacula supports differentials as well as incrementals.

As already indicated, best is a matter of situation and perspective. Tell us more about your situation, and perhaps we can offer more specific advice. Otherwise, start with something like http://en.wikipedia.org/wiki/List_of_backup_software and explore out from there. I'm sure that list is just the tip of the iceberg. There's gotta be even more than that out there.