I used TM with OS 10.8.5 WITH EASE FROM 2015--01-01 with automatic reminder every 10 days.
MBP linked by USB to 3TB LA CIE drive.
Then updated OS to OS 10.12 in 2017-01 and since then TM seems erratic.
Seems to take many hours so I have had to change Energy saver to "NEVER" SHUT DOWN.
The latest fiasco 2017-04-17 was when TM decided to create about 7 backups one directly after another.
I had assumed that changing OS would not require me to do anything with TM.
But is there something I should have done to TM Settings?
Is there a way back to getting TM to its old habit of backup once every 10 days?
And not taking hours for each backup.