I use my OG pixel phone plus syncthing for unlimited photo and video backup on Google photos. Think I'm going to move away from this soon though, trying to slowly get away from Google.
I have an old OWC Mercury Elite-AL Pro Qx2 4 Bay Hard drive RAID Enclosure (1st generation) but I can't get it to be recognized by a computer. Mostly trying with linux over usb.
I've been thinking about maybe removing the electronics in it and just using it as an enclosure. It holds 4 drives nicely with a fan.
Any thoughts about what I could use, I'm fine with just a USB interface. I don't need fast data access.
EDIT:
other hardware I already have that could be useful: