Re: Drat
"If there is something along the lines of some integrated free- or cheap-ware that would do the job on an old computer and is reliable and easy for non techies to set up (so I can also recommend it to friends)"
Take a look at Nextcloud. Also, although I haven't looked closely at them, I understand some NAS boxes also do this but not as a s S/W only package.
Biting the hand that feeds IT
