Mac and windows apps that can do incremntal backups accurately

[Sossity Corby]

I have 2 alternating external hard drives, in which I have one at home (drive A) & one offsite (drive B), I bring the offsite one home to backup the newer drive A contents to, so far I have used disk utility, on a mac & just copy the whole of hard drive A to hard drive B in an overnight backup, but these backups will take longer as I get more content.

Is there a mac app or windows app that can tell the new files on the home drive A & copy just the new files to the offsite backup drive B? without me gong through disk utility or doing it by hand in finder?

any suggestions for either mac or windows, I work in both platforms. I would also like something that can copy & backup ipod content as well, like my itunes library.

Sossity

[Marc Beije]

On Windows, I use SyncBack to create incremental backups to two separate external drives. Basically, it will do a compare of the source and target directories, and only copy the changes. In addition, it can do several other types of backups (e.g. mirroring one directory to another), and has other useful functions, so I can recommend it (no, I'm in no way affiliated with the program ).

Marc

[Sigi]

On the Mac side I can recommend Superduper. Also check out Carbon Copy Cloner and Chronosync

[Jonathan Lipkin]

Chronosync will do precisely what you are asking - create a mirror of drive A onto drive B. There is a verify copy option which will add to the integrity of the backup.

I use this to sync to my image backup drive using a script that runs it every hour.