I was here to say the same as pezhore, separating storage and compute is almost as important as separating church and state. Muck around, break things, have fun, all the while your data is safe (don’t forget offline backups though). The MS-01 is a fine looking box, but any old NUC / SFF will do for your purposes (modern AMD cpu or a graphics card if you need / want plex transcode).
Edit to add, old laptops are great compute nodes (maybe moreso from my ex corporate thinkpad laptop bias, but still)…