Since it’s a domestic government website, I wonder if other copies are archived at Library of Congress, National Archives. WB machine supports my contention, but it is sometimes inadmissible. I wish I could be more specific, but if there’s a settlement, there could be non-disclosure.
I would have to say that all the comments have been quite good, and I’m impressed.
Most gvt websites are backed up offsite, and non-security sites are usually backed up to secondary private vendors - Though the nature of the backup is beyond my ken. However, there are lawyers that do this sort of thing, and they will know how to proceed... Again, lawyers and computer forensics...
Good luck.