A:Answer Hello, Alpha14!
Any books you have purchased through Amazon for the Kindle would be tied to your Amazon account. Make sure that you use that same account when you set up your new tablet. Once you do that, you would be able to download all of the books from the Kindle app on the tablet. As far as the movies, if you have purchased those on your Amazon account, you would also have access to those. As far as everything else, you can use the Backup & Restore feature to do that. With the Backup & Restore feature you can back up everything that is integrated with backup and restore.
First ensure that the first device is connected to the Wi-Fi and has the Backup & Restore feature ON in Settings > Device Options > Backup & Restore. When you set up the new Fire Tablet, you will have the option to set it up as a new device or restore your content from a backup.
Backup & Restore is initiated in the out of the box experience to restore content from a previous device and is also available on the device settings at: Settings > Device Options > Backup & Restore. Enable backup if it is not already enabled. Press the Back Up Now button.
How it works:
Backups are automatically completed daily if device is connected to Wi-Fi and on standby for long enough, or can also be manually started from settings.
Note: In-app purchases are not backed up unless this service is provided by the app developer.
Only one backup is saved for each device, older backups are automatically deleted. Backups do not count against your Cloud storage.
I hope this information helps. Have a wonderful day!