time machine won't back up to my new imac
time machine won't back up to my new, latest version iMac
iMac 24″, macOS 11.5
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Please tell us what you are doing to try to get Time Machine started.
It should be simply a matter of plugging in the external drive, formatting it properly with Disk Utility (or letting TM format it for you if prompted) and then switching on Backup Automatically in System Preferences > Time Machine.
Back up your Mac with Time Machine - Apple Support:
https://support.apple.com/en-us/HT201250
If you are getting an error message please tell us about it.
Do you have any other details about the trouble?
