There are a few things that you can try if your Time Machine backup won’t start.
First, make sure that your backup disk is connected and that it has enough space.
If your backup disk is connected, but you still see the message “The backup disk is not connected”, try restarting your computer.
If your backup disk is connected and you have enough space, but Time Machine still isn’t working, try resetting the Time Machine preferences.
To reset the Time …
