Can on use more than one hard drive to backup with time machine ?

Can one use more than one hard drivewith time machine ?

Yes, if you have the Mountain Lion operating system installed on the Macs that you want to back up.
I don't know what the maximum number of hard drives might be, but I have tested with 4 and it works fine. Time Machine automatically rotates the backups when you do this, so drive #1 will be backed up first, then #2, #3, etc. and then back to #1, etc.

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