The Astro File Manager is what I use on my Droid. It has a built in backup for your apps. This will produce an .apk file so that the app can be reinstalled. It does not (to my knowledge) back up any data produced by the app, so you still would need to use the local backup on the eDGe to backup your data. I have not tried Astro on the eDGe yet, but will do so.