Hi!
We had a little longer to wait but I do have some awesome news for you!
The data "lost" in the server upgrade was actually only the visibility of the systems you scanned (mostly during 5th to the 6th of October). What this means is that the scanned data you obtained was intact for the entire time, just hidden from you (and me). The conclusion is that you'll still be given (or have been given) credit for all of this data, and all of your first-discovered tags will be applied (but may not show until you look at the system again). This is all assuming your scanned data isn't lost by death
That means we should never really have an issue with scanned data and you'll not have lost out on anything other than some visibility of a small set of systems.
I hope this all makes sense, and a huge thanks for your patience while I looked into the issue. If you need a hand with anything else or you have any followup questions, please ask!
It's been a pleasure, Fly safe!
CMDR Vanguard
Elite: Dangerous Customer Support Wing