I got an HP DL380 with 16 drive bays, and I basically just dump any old hard drives in it whenever I upgrade. I have 24TB in it, had it for years, and I’ve only ever lost one drive at a time, and I just shrink out the dead drive, and then toss another one in if I get a new one. “I’ll move your files to your new computer if I can keep the old one…” I even 3d-printed a couple of 2.5"-3.5" adapters to stuff old laptop drives in there. Caddies? Uhh… I think it was 120$ from the local electronics recycler. It’s old, it’s slow, it’s basically a giant samba share.