I'm used to Windows. When I get new software, I always store the original install file (exe) on a USB memory stick where I can access it if need be. My question is: with Android, for example if I go to the Google Play Store and get an app (either a free app or pay app), is it easy to find and access the install file (apk) and store it on a USB memory stick? If so, how do I do this (find the original apk file in the Android device)? Let me give a specific example. There is an app called Radio Rip. The link is here: https://play.google.com/store/apps/details?id=com.spartacusrex.radiorec&hl=en As you can see, this app is about $3.00. Unlike a typical Windows application, I guess there is no trial version of this app. You just pay the $3 and get it. If you like the app, great, if not, you only lost $3. I got the app. I noticed there are some misspelled words in the interface (a hard pill for me to swallow). But to some degree, the app does work. I am able to record a few radio stations that I like. So I would like to find the install file (apk). If the Android device has a major problem and I lose the software, I could just re-install the app from a backup apk file.