Sure. My NAS I use for backups is also made from ancient desktop PC running ownCloud. The system is slow-ish by today's standards, but since I had it already, I could invest in bigger SSD for data storage.
Saving for later
Just google perfect media server
Yes. Go look at TrueNAS Scale
Some ppl pointed out you can. NAS it's just a tiny computer with a dedicated enclosure running 24/7 with a lot of services running to do multiple things because...is running 24/7! Is you just want to upload some files for a backup is better an external HDD through USB. Connect, upload, disconnect.
If you want your computer do more things you have to check how the computer handle these services by software or hardware(hardware better) A list of questions:
If a few of questions, or all, are NO I think it's better to invest in an external USB HDD case.
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