A simple tool to list, in chronological order, all system and security updates. Runs on Sierra and High Sierra, and should be good on El Capitan too.
softwareupdate
Time Machine backups are but one of 70-80 background services which are run by macOS dispatching systems. Here’s a list of some of the others.
If there’s one update that we need, it is an App Store app which works reliably. The current one suffers from general dystopia.
Installing a Combo update of OS X is a popular panacea for puzzling problems. But you need to do a bit more to complete the job.
The Eclectic Light Company 