>BUT what I want to know is, can Amazon remove any documents I transfer(via laptop) to the Kindle?
No, that won't happen.
>Do they log those documents as well - e.g. pdf's etc?
No.
>They don't keep a back up of my uploaded contents do they - but only only Amazon (.azw) files?
They don't really keep track of anything. It's just that your Amazon purchases are available for download to your Kindle from the Manage You Kindle page.
In theory they could do almost anything, in reality they won't do anything.
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