Most PC's come with built in network/ethernet card these days, so if you have another PC, just copy all files you want to save to the other PC.

I use a homenetwork since years, works great.

Downside of it;
the whole familly bring their PC's to my place to get a back up..
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76