Main computer had an glitch, had to use Time Machine to get everything back to normal. Good job I have multiple backups so that occasional minor issues don’t become a major calamity.
Currently I use 4TB external hard drives for backing up data on the Mac Pros, but I will soon have to switch to an 8TB external hard drive on the newer computer as the amount of data grows.
I also keep off site backups of data on other external hard drives just in case of fire or flood at the office. Finally all documents and a selection of images are also saved to the Cloud with Dropbox.
Hard drives fail. Protect your data.