APFS and Time Machine: CAUTION

Don't convert your Time Machine volume from HFS+ to APFS

Time Machine can work with APFS volumes, but the shape looks like this:

• Time Machine can archive files from both HFS+ and APFS volumes.
• Time Machine volumes must be HFS+.
• You can use Disk Utility to upgrade a Time Machine HFS+ volume to APFS without a warning. You’d think Disk Utility would detect the Time Machine backup and stop you, but it doesn’t.
• Once upgraded to APFS, the Time Machine backup archive is mostly useless, even though files aren’t destroyed.

The archive becomes useless, because APFS doesn’t support hard links. These are a special kind of alias. A soft link is a pointer to a destination file that looks to the operating system like a pointer. A hard link looks to the operating system like an actual file, even though it’s just a pointer. This allows a single copy of a file to be in a filesystem, but have many pointers that reference it, and they can be manipulated and copied as if they exist in multiple places.

(Macworld)

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