How to wipe a Mac Mini M1 clean for sale?

[isza41]

Hi All,
I am preparing my Mac Mini M1 OS 15.5 for sale and would like to have an original factory setup reinstalled. I have cleaned it from non-original software already but do not know, how to:
1. empty my Apple Contact List ( about 550 contacts) I can not just throw it into the bin and a one-by-one delete would need ages.
2, how to preserve the content of several Apple Mail mailboxes on an external SSD before deleting all mail.
Can somebody he;p?

Thanks in advance! Andy

 

[MacsBug]

Hi Andy,

To erase the mini just go to the System Settings > General > Transfer or Reset and select Erase all content. This will take the mini back to as if was new,

As far as the mail is concerned, you can save the ones you want by just highlighting them and drag them to an external drive. They will save as individual email files. However Most email services use IMAP which means that the emails are stored on the web. there may not be a need to save them, just sign into your account with another device and you will have access to them.