I use a USB to backup but....I backup the entire ProWinXX file by copying it from Win Explorer.

This is the best way because it copies the complete program and client files.  If you need to reinstall a prior year I recommend:

download the program directly from your My ProSeries account.

Install the program, put USB in slot, open Win Explorer and copy ProSeries ProWinXX from the USB directly to the ProWinXX you just installed.  The USB files will override all data into the new install.

Close Win Explorer, click on Start/Programs, scroll down to the ProWin you just installed, click to open menu and run Homebase Maintanence. When you log in to the program it should be an exact duplicate of what you backed up.