Backups are importants. You need them to not lose work you've done, pictures or important documents. It's also useful to be able to quickly get back to a working system.
I use Timeshift to backup the operating system and BackInTime for personal files. Both run daily and save the data on an external drive. Today I got the chance to test the restore function of Timeshift. After a system update I was unable to boot. I launch a live usb, installed Timeshift and easily restored yesterday snapshot. It's was quick and easy.