Feature: Backup Persistent Storage to make Clones and Backups

[BenWestgate]

https://tails.net/doc/persistent_storage/backup/index.en.html

Previously Bails had custom code to create backup USBs without a restart. That code was submitted to Tails and now Tails offers the same functionality making it redundant.

The new tool provided Tails needs to be tested so that I can guide and remind users to make backups of their Bails USB to preserve their wallet meta data and blockchain.

As well as to make clones.