I haven't looked very hard so there could be backup services I'm missing. So far I've found restic/autorestic and duplicati, but I'm not sure what their differences in purposes are or pros/cons between them.
Also I've heard Unraid has a flexible storage solution which would be nice as I would like to just upgrade as I go instead of planning substantial disk upgrades, but are there also solutions for that on custom built systems instead of SHR?
Yeah this honestly makes me hesitant to download idk why there are so many data sharing permissions. Maybe they're default?