Transfer migration can’t find source

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Transfer migration can’t find source

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If you can't back up or restore your Mac using Time Machine - Apple Support

https://support.apple.com/en-us/HT204157

Trouble Shooting Time Machine

https://support.apple.com/guide/mac-help/time-machine-troubleshooting-mh15653/mac

3-2-1 Backup Strategy: three copies of your data, two different methods, and one offsite.