My iMac doesn't start

I want to repair my Mac using disk utility. I have a Time Machine backup stored on an external hard drive. My question is if I use the external hard drive to the top of my iMac to will damage the restore process or erase what is stored on the external hard drive?

Time Machine restore should not damage or remove the external hard drive.

See > use Time Machine to back up or restore your Mac - Apple Support

However, it is always a good idea to have a second backup just in case something should go wrong.

See > Time Machine: how to transfer backups from a current backup disk to a new backup drive - Apple Support

For years, I use a backup strategy increase include a backup Time Machine, more daily and weekly Clones made with CarbonCopyCloner.

Tags: Mac

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