What is the lingering danger of Time Machine and APFS?

eicca

macrumors 6502a
Original poster
Oct 23, 2014
504
312
I still haven't upgraded to 10.13 because I've heard something happens to Time Machine drives.

My Time Machine drive is a 500GB HDD, old-fashioned platter style. Is it that APFS doesn't work on HDDs and 10.13 Time Machine can only read from APFS, or what's up? What am I missing?
 

techwarrior

macrumors 65816
Jul 30, 2009
1,203
456
Colorado
TM drives cannot be APFS, even if they are external SSD. There are numerous posts about issues with TM running on APFS formatted drives. Currently, only internal SSD are supported for APFS.

When you upgrade, if your internal boot drive is SSD, it will convert. All other drives, including external drives, internal HDD and Fusion will all be left alone.

APFS can be used to format external drives using Disk Utility, but there really is little to be gained by doing this.

I suspect that eventually, all drives will be supported with APFS.
 

eicca

macrumors 6502a
Original poster
Oct 23, 2014
504
312
Guess I’ll back it up, and if the upgrade goes south, downgrade back to Sierra before trying to restore from Time Machine.
 
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