I bought my iPad for specific on-the-road purposes: internet access and downloadable high resolution topo maps for off-roading away from home. "Topo for iPad" seems to work just fine.
Since I use Yahoo Mail, the files are not stored on the machine. So no backup required. Same with Topo. I appear to need no backup, so is there any good reason to link up with my PC? I prefer to keep it stand-alone if possible -- Keep It Simple.