When scheduled backups become irregular or stop, this affects much more than just Time Machine. This is what happens, and why you must restart.
Sierra
Each report on your Time Machine backups now comes with a detailed timestamp in this new version.
Conventional log analysis gets precious little from Sierra’s unified log. Automated analysis has much greater potential. Will Apple head in this direction too?
How to run one-off backups, how to cancel automatic backups, and how to set your own backup schedules.
This completes the intended feature-set for the first release version: T2M2 can now make better backups too.
Adds a new set of analyses to discover the underlying cause of infrequent and irregular automatic backups.
You can back up multiple volumes to multiple backups. Here’s how and why you might do these things.
And the most important fix: the colours of the traffic light indicator are better.
A full explanation of everything that T2M2 analyses and reports, with practical tips on how to interpret and fix.
How scheduling concurrent and background tasks using XPC Activity works, and compares with alternatives such as NSBackgroundActivityScheduler.
The Eclectic Light Company 