How do I make a Time Machine Back up of my mac
How do I know if my current mac is backed up by TIme Machine I have purchased a new iMac and am trying to do the transfer myself?
iMac 21.5″, macOS 10.12
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Welcome to the Apple Support Communities.
For backup instructions, see: How to back up your Mac - Official Apple Support.
For moving data to a new Mac, see: Setup Assistant and Migration Assistant - Apple Community.
Jack