OS X Mountain Lion: Time Machine problems

Time Machine problems

If you have trouble with Time Machine, the information here may help.

You see a message that Time Machine must create a new backup

Refer to this topic:

If you see a message that you must create a new backup

The backup disk is unavailable or can’t be found or “mounted”

Refer to these topics:

If Time Machine can’t find your backup disk

If you need a password to unlock your backup disk

Apple Support article: Time Capsule: Time Machine backups do not mount

An incomplete, interrupted, or failed backup occurred

Refer to these topics:

If a Time Machine backup is interrupted

If Time Machine doesn’t back up certain files

Apple Support article: Time Machine stops backing up to external disk

You can’t find an item you backed up

Refer to these topics:

If Time Machine doesn’t back up certain files

If you can’t find a backed-up file

Time Machine is slow or seems stuck

Refer to these topics:

If your Time Machine backup disk runs out of space

If Time Machine is slow

If Time Machine remains in the “preparing” stage

General troubleshooting

Make sure your backup disk is plugged in, turned on, and securely connected to your Mac. If your backup disk is on a network, make sure both the disk and your Mac are connected to the network. If the network is experiencing problems, your backup disk may not be available.

Download and install all recent updates to OS X. If you have a Time Capsule, update it with the latest software and firmware.

Keep your Mac up to date

Apple Support article: All about Time Capsule, AirPort Extreme, and AirPort Express base station firmware updates

Last Modified: Aug 8, 2013

Additional Product Support Information