The data that has been provide can be reproduced in the event of any query, allowing the cause of any problems that might arise to be determined
Q: does the system store the actual text of the briefing one gets?
If so, how long for?
I happen to know that if you do an alleged TRA infringement in France (on a flight originating from the UK, for example) then you hear nothing for up to 6 months, at which point you get a letter from the CAA saying the DGAC asked them who the pilot was, etc.
So AIS would need to retain all briefings for at least that long, to be useful. Probably for a year. That's a lot of data.