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I don't know anything about Kindle app for Android - I assumed you had an actual Kindle device.
Either way, you can always log in to your Amazon account, go to "manage my Kindle" and re-download books you've purchased to the PC, then do whatever you want with them. If you're archiving them though, be sure to make note of the device ID for which the books were ordered; every book is locked with DRM specific to the device for which it was ordered so if you want to read it on another device later on, you'll have to unlock it using that device ID.
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