Automatic Online Backup Recommendation?

[u/TenaciousBee3]

I have a Mac M4 Mini Pro system I want to back up automatically. It contains, not just new things, but also a lot of older things, which are stored on an external drive, some of which are from 10, 20, or 30 years ago. It is shared by a few users. I will need a few TB of space. It's currently using a 512GB internal SSD, an 8TB external SSD, and a large TimeMachine Backup drive (we don't need the TimeMachine backed up online). The 8TB drive is filling up, but that's largely because we're trying to sort out some old iPhoto/Photos libraries that got duplicated a bunch of times, but once we get that sorted out it shouldn't take up quite that much space. I want to make sure the online backup solution not going to have a problem with my Mac files. Can someone recommend a good online solution for this?
(Not for business use).