This is a followup to copying an old Time Machine backup to a newer, larger disk literally takes months, any way to speed up / make it incremental? .

tl;dr on that: I'm trying to copy a 6 TB nearly-full Time Machine disk to a new 12 TB disk and use the new disk instead. The suggestion from the above link (thanks @benwiggy): "Use Disk Utility to 'Restore' the old disk onto the new one."

So I boot into recovery mode (new Catalina upgrade), restore to the new disk from the old one, and see

Could not validate sizes - Invalid argument. The operation couldn't be completed. (OSStatus error -50.)

This seems to be, actually, an invalid argument error message. Any wisdom? (Is it perhaps not possible to restore onto a larger disk and that's the size-validation concern?)

  • I am guessing you have the old HFS+ formatted TM disk. Can you confirm?
    – Gilby
    Nov 11, 2022 at 2:36
  • If HFS+ you might have luck with SuperDuper as suggested here dancarrphotography.com/blog/2020/03/05/… I can't confirm as I always start a fresh TM and keep old one until not needed. I realise that is not strictly your question.
    – Gilby
    Nov 11, 2022 at 2:40
  • MacOS Extended (Journaled). I believe that's HFS+. (It's a spinning-disk drive, not SSD.) I will give SuperDuper a whirl. That blog post, I think, could have been written by me. Thanks @Gilby! Will report back.
    – jowens
    Nov 11, 2022 at 4:39


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