April 1st was "World Backup Day". The website says something like 'don't be an April Fool, no way, backup today'. Regardless of the day, I'm a big fan of backing up your electronic device, whatever it is. Here is an excellent article, from iMore, with tutorials on how to backup all your Apple devices.
You'd hate to lose, for example, all those pictures you've taken of your travels, family and friends. Backing up is simple, and is relatively inexpensive. For my Mac I use the program 'Super Duper' and an external hard drive. This does a full clone of everything on my hard drive, including the underlying OS. If a disaster should happen to the Mac's hard drive, after it was replaced, I would be able to boot from the external drive and reload everything I had on the drive.
The iMore backup guide is a good one, so I suggest you take a bit of time and read the tips -- and most importantly, do a backup.
Jim Hamm