I figured out that extra code is added each time we do an export import.
E.g., we had PVM5PVM5PVM100 in the VAT codes, after an export-import we have PVM5PVM5PVM5PVM100.
So the mystandard have gotten a face lift.
So when the backup is triggered, thats the time when a "snapshot" is taken from the system and written down to the backup (.TXT file)...