Since you can now export settings AND you have a pro key file have you considered creating a XPrivacy subdir off root folder of sd card and keeping everything in there? Eventually you might add other files etc to the folder without cluttering the root of the sd card up. Backups could be modded to just backup the whole dir which would also potentially keep backups of the person's keyfile.
I thought of some of this because I have a Nexus 4 and in their infinite wisdom they decided if you ever flash a factory rom image it wipes everything and since the sdcard is one large shared area with system etc it also gets wiped....custom rom's with CWM or other recovery mechanism's don't do this obviously but it bit me when I was upgrading my phone to 4.2.2 and the automated download/upgrade failed requiring me to download the whole image and full reset to factory.
Nevertheless I don't think there will be anything more than the license and the export.
Th export can always be created again and the license is sent by e-mail (so there will probably be a backup).