I forgot about the 100-song limit for the free version. There are other free programs (without limitations) that will transfer files between iPod and PC, just do a Google search.

If you store the songs as data (not as audio CD), you can fit a lot of music on a CD (700mb), or by storing songs on DVD (8.5 GB) you could probably fit your entire music collection on a few disks. That's how I back up my music.