Several bugs and issues in the log command will not result in errors, but will misleadingly return no log entries when used in search predicates.
Free, works with Sierra and other unified logs, examines log entries already in the log, unlike Console. Now supports logarchives and more.
When scheduled backups become irregular or stop, this affects much more than just Time Machine. This is what happens, and why you must restart.
How scheduling concurrent and background tasks using XPC Activity works, and compares with alternatives such as NSBackgroundActivityScheduler.
The good thing about the Sierra 10.12.5 update is that it seems to have caused few problems. But what did it actually address?
Tread carefully in the Print dialog of Contacts: its liable to cause an unexpected quit.
Sierra 10.12.5 claims that the App Store app has been enhanced. That’s not what I have seen.
Currently they all look like old bugs, some going right back to Mavericks and earlier.
When part of the mechanism which schedules and dispatches Time Machine backups fails, those backups become irregular. Here it is shown in a clear diagram.
Diagrams how a routine Time Machine backup is scheduled and dispatched using CTS and DAS.