What do you use to backup your system?

[Flyboy]

We all know the 3-2-1 of keeping any electronic files, its probably why most of us are running HexOs on a NAS. Three copies of your data, Two different storage formats and at least one offsite. What applications are good for backing up the NAS? Also, what applications do you use to backup important PC files to your NAS?

I am still new to owning and running a NAS, and so far all I have is Plex and Immich, but I am curious what other applications people like and are must haves, especially if its dealing with backups for your data.