Can someone please advise which of these i select to erase my HD?

Joined
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Blue Mountains NSW Australia
Your Mac's Specs
Silver M1 iMac 512/16/8/8 macOS 11.6
Are you booted from the backup on an external drive as it does not appear?
 
M

MacInWin

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The one you want is the indented Mac HD, but as Harry said, you have to be booted from something else. You cannot erase/format the boot drive.
 
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Your Mac's Specs
M1 Mac Studio, 11" iPad Pro 3rdGen, iPhone 13 ProMax, Watch S7, 2018 15" MBP, AirPods Pro
I thought "clean install" and "from a backup" would be two separate things? Are you trying to do a clean install of Mac OS X and then restore your files from a backup, or are you trying to restore from a Time Machine backup?
 

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