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How can I backup Catalina ,Mojave, high Sierra from the one computer on the one time machine drive

R

redsquash

macrumors member
Original poster
May 6, 2008
80
0
I need to back up all these operating systems on one external disk
for a week, at the same time ; for reasons that are irreverent to my question.
  1. Catalina installed on MacBook Air
  2. Mojave external boot for Mackbook Air

  1. Catalina installed on iMac
  2. Mojave External boot for iMac
  3. High Sierra external boot for iMac

How do I do this and not purchase an additional HDD?

I have a 7tb SSD drive
I need to know which operating system backup goes with the relevant computer.
Obviously I can't rename the files .
thanks for any relevant advice targeting the question
 
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