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Personally, I really love Syncthing https://syncthing.net/, if you do not need an iOS client.

I have it set up on all my families windows machines, my personal machines and between two NAS. One of the NAS does nightly backups to backblaze.

For using Syncthing on iOS, there's Moebius sync, which encapsulates the syncthing client as a one-time paid application.

Works pretty flawless.

Agreed, though you do have to export your photos and videos to another folder before you can sync them. I do that weekly.