When Time Machine backs up an APFS volume, it works quite differently from the way it did on HFS+. Explored here using log entries from Mojave.
T2M2
More friendly, it runs checks in the background as much as possible, and has improvements in displaying results.
Do you work from a normal user account rather than an admin one? This should let you check Time Machine using the T2M2 app.
Should fix a bug in which T2M2 reports an error message rather than completing an analysis of Time Machine backups.
AutoPkg is a framework for macOS which allows system administrators and similar to deploy software to managed clients, […]
All these have now been updated and should pass Gatekeeper checks and run on both Sierra and High Sierra.
Test versions of LockRattler and T2M2 which shouldn’t have any problems getting out of Gatekeeper’s quarantine.
Time Machine diagnostics now available for Sierra, and (in beta) for High Sierra.
A strange problem with backups that start, but fail to complete successfully, apparently because of duplicate filenames. T2M2 to the rescue, bringing some important lessons.
Now places its report in a scrolling text view, has extensive Help book, and more. The only tool for checking that Time Machine backups are being made properly.
The Eclectic Light Company 