As far as Maxi Sys Pro goes, the current version I have in USA on mine is now at 2.41 Lib version 2.41.11. When I first got it , it was 2.23. From what I read , once your system is upgraded to a higher version all the backup folders you created with the older system version become useless and won't work as backup software any longer.
During current update subscription , If you don't update your system software when the system updates comes out , you likely aren't going to be able to get and install the new updates of the car make software either. After each newer System update you now have to take time to do another backup of the scan folder and cross your fingers. However With BMW files now being stored to an added external SD card , I don't know how to even do a backup of the entire Scan Folder, Maybe with a USB flash drive?
I had a DS708 that I was able to create working backup SD cards , and I sat on the sidelines 3 years waiting to see if all the software issues after Ford Lawsuit get resolved, and if there ever would get a rock solid fool proof way to create working backup of software that would work if you ever needed to do a factory reset and reinstall the software again after update expiration but it seems Autel is doing everything it can in hopes to get you to purchase another year of updates sooner than to upgrade to a new platform later.