For now my server doesn’t have very important data most of it are your “Linux isos” I can just download again and I’m thinking of starting to move my file and photos to the server but in afraid. What if I get a ransomwarei don’t realize and all my backups get encrypted too? Or if the backups are corrupted and my disks breaks? But also I’m afraid about cloud because I’ve seen some posts about people getting their google accounts closed without notice for breaking TOS (maybe they did something wrong maybe not).
ZFS (mirrored) two HDDs. If one HDD fails, then replace it and let it rebuild. Use 3 HDDs mirrored if you really think you could get a failure while the array is rebuilding.
Also have two external backups, one you do regularly at home, and another you keep off-site. When you visit that location (be it your parents, siblings, relatives, friends house) swap out your external backup with their off-site to ensure its kept up to date.
Make sure all disks are fully encrypted of course.