Building a NAS in this day and age is trivial. Hard drive space is cheaper and far more economical than paying $20 a month for a service. The way prices are going it's going to soon hit parity with car payments.
I had an old PC from 2012 with an i3 dual core in it. Ran a headless Linux server. Raided the 2 3TB drives. Done. It was replaced by a 4 TB SSD and since those have nowhere near the failure rates of HDDs, one and one. It servers files off my main computer which is a beefy Mac.
Enabled file sharing. Opened the port on my firewall. Done. It's one of the easiest services to offload to a homebuilt rig.