Use a Single Backup Disk with Multiple Macs

You can use Time Machine to back up more than one Mac to a given drive (with or without a Time Capsule). A single partition can store backups for any number of Macs, without getting them confused, as long as it has enough free space. In most cases, you don't have to do, or know, anything special; just plug in the drive (or connect to it over your network), select it in the Time Machine preference pane, and let the backup run; repeat the procedure with each computer you want to back up. If you're physically moving the drive between machines, Time Machine should automatically recognize it and back up on its regular schedule, without further intervention, after the first backup.

Note

Eject safely: Before ...

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