One thing, though - you can't make images of copy-protected disks. There's not enough information in the ADF file format. For copy protected disks you need all sorts of extra things - not necessarily to read but to write them back.
There's a project going on called the SPS (formerly CAPS) at
http://www.softpres.org/ for the preservation of game disks.
When it comes to your own game disks, though, I'm afraid there's not much you can do, unless they happen to be non-copy-protected (i.e. AmigaDOS games like Robosport or hacked games).
