NextCloud is a very excellent open source private cloud storage system. I have installed and used NextCloud on the VPS host before. At the same time, I used Aria2 offline download to turn the server into a film and television download center, and then used a video player that supports the WebDAV protocol, so You can watch videos anytime and anywhere.
Raspberry Pi: Ten issues in building a low-cost NAS storage home server
I have a Raspberry Pi 2 in my hand and a spare mobile hard drive. I am thinking of using the Raspberry Pi and the mobile hard drive to build a low-cost NAS. Just a while ago, I was struggling with how to download and build Nextcloud offline. Installing Aria2 on Raspberry Pi is also a very simple matter.