
Note: Time Machine can also be setup to Backup Mac wirelessly to an External Drive available on the same Network. This will allow Time Machine to store multiple versions of data, which in-turn will allow you to go back in time and recover files before you made any changes to them. To make the best use of Time Machine Backups, the storage capacity of External Drive should at least match the storage capacity of the Hard Drive on your Mac. If the attached Storage Drive is not in the right format, Time Machine will automatically prompt you to Format the Drive.

Time Machine can practically backup to any Storage Device connected to USB, Thunderbolt or the FireWire Port of your Mac. External Hard Drive Capacity for Time Machine Backup? If the External Storage Device runs out of space, Time Machine automatically deletes the older backups to create storage space for daily backups.
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If enough storage space is available on the External Drive, Time Machine keeps hourly backups for the past 24 hours, daily backups for the past month and weekly backups for all previous months.
