@Addle - Unter BigSur you may still use Mac OS Extended (Journaled) as TM files system. No problems then. On Monterey, you unfortunately might no longer add a non AFPS case-sensitive (adding a pre-formatted HFS+ disk to the list of TM disks, Monterey forces it into a APFS case-sensitive, independent if you check "Encrypted" or not.
PS, FYC, @Apple: there are many file system/Finder issues in Monterey. Even Quick View does not work as expected (e.g. chapters in MOVs not shown).
Pipobike
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@Pixalab - how did you fix it?
@jkrosado - didn't fix my (same) problem:
Running First Aid on “TM8TMB16” (disk3s2)
Checking file system and repairing if necessary and if possible.
Volume was successfully unmounted.
Performing fsck_apfs -y -x /dev/rdisk3s2
Checking the container superblock.
Checking the space manager.
error: (oid 0x7013) cib: found zeroed-out block
error: failed to read spaceman cib 2 at address 0x7013
Space manager is invalid.
The volume /dev/rdisk3s2 could not be verified completely.
File system check exit code is 8.
Restoring the original state found as mounted.
Problem -69842 occurred while restoring the original mount state.
File system verify or repair failed. : (-69845)
Operation failed…
Then trying to mount ends by error message "Could not mount “TM8TMB16”. (com.apple.DiskManagement.disenter error 49218.)"
Unfortunately not for me
Not for me. This is most probably (99.99%) an issue to be fixed by Apple’s macOS developers.
That does actually fix nothing. Next time you unmount and try to mount again, you face most probably the same problem.