When Sierra’s automatic backups stop or become irregular, other functions fail too. Here are some important and more obvious ones. Is this fixed in High Sierra, and does it affect iPhones too?
synchronisation
High Sierra has done away with the ntpd daemon for keeping your Mac’s clock in sync with a standard time server. This now works as in iOS, using the timed daemon.
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.
Why did Apple keep the headphone socket on its new MacBook Pro, but remove it from new iPhones?
An overview of some of the many ways of keeping folders in sync, backing up, and making remote copies.
I have been trying to sync Safari bookmarks using my Dropbox, but it is not working. Why?
What is the best way to move contacts from Outlook on a PC to my Mac and iPhone?
Time is central information for many functions on your Mac. This article explains the Network Time Protocol, and how it keeps time in OS X.
The Eclectic Light Company 