I have heard many tales of woe from people who have lost their precious photos. There is even a virus out there that encrypts your picture files and you have to pay them money to get a key to decrypt your own pictures so you can view them again. Therefore I highly recommend that you find a process that works for you to keep your digital life backed up. Actually I recommend at least two methods of backup. You have invested a lot into your digital files, protect them.
If you are doing some kind of local backup find a true backup program that does incremental backups so that you only need to store and protect the files that have changed. I don’t have a recommendation as I do not do this anymore and the system I used for about 10 years is no longer available. Keep in mind you need to physically protect the backup as well as electronically protect it.
If you are comfortable with an online backup that is the easiest way to go. Personally I do both, I have a local copy of all my pictures, videos and documents on my NAS and also have an online backup just in case something happens to my house.
Setting up Sync is a skill worth learning and it will give you truly private, automatic backup to a remote location. If you feel the remote location is physically secure you are good.