Thanks a lot for your informative answer. Really. That was probably mostly what I wanted to know - if 100mbit is enough. In that case I'll use my old pentium something, ubuntulize it and stick it in the store room. Power usage is not really a problem - economically. Unlimited usage, fixed price, included in rent... Also, during my 25+ years I think I've experienced one power failure so power failure is not a problem either. Though perhaps a UPS might be wise to invest in anyways. At least along the road.

Tahnks a lot!