Running version 7.045:
Apparently there is a behavior where if a Design Backup server is destroyed (Rather than hacked/corrupted), the design it held will be transferred to another server somewhere else in the galaxy.
So, 3/4 of the way through the game, I hacked a server and downloaded 6 (!!!) separate blueprints for ships. My hacking progress was around ~200, my cost to hack was 253.13. Finishing the hack on this server gave me three separate messages, one telling me I got 3 blueprints, the second with 2, and the last with the final blueprint downloaded. However, all six blueprints were "counted" as downloaded for the hacking progress, making my new requirement for downloading a blueprint 2883 (!!!) and giving me a new hacking progress of -5000 or so.
After clearing one or two more planets, I found the final design backup server. However, attempting to hack this with such high negative values the AI tried to do literally everything it could about six to 15 times over in response to hacking. I.E.: It summoned 6-7 exogalactic waves, reprisal waves AND tachyon radiation on the hacked planet, all at once. Needless to say, this locked the game quite hard. It was funny, though!