I have a Time Machine backup drive (also used for other archival purposes) which has a damaged file-system. I am able to mount it "Read Only," but fsck_hfs will not repair it. *(Apparently it's just a problem with "extended attributes," but this is enough.)

I've ordered a replacement drive, and now I need to know what is the best way to reliably copy all of the information from the old drive to the new, properly preserving permissions and everything else that Time Machine (in particular) requires. Is there, for instance, a Time Machine function to "move backup to a new drive?"

(OS/X Catalina 10.15.3, current.)


"Transfer Time Machine backups from one backup disk to another."


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    When answering your own quesition please take the time to enter the steps you followed as sometimes these diviate from the cited source and also the original website could change or disappear. – unknowndomain Feb 10 '20 at 22:12
  • The general opinion (on the internet) seems to be that doing it the Apple recommended way (by using the finder to copy the files) is a terrible way. It takes forever, often fails randomly part way through, and appears to produce larger copies. Much better is to use SuperDuper. See for example: dancarrphotography.com/blog/2020/03/05/… and apple.stackexchange.com/questions/35149/… – Tim Dec 12 '20 at 18:41

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