First ... a lot of you are missing some of the basics ... physicallity.

Acid is still legal. Improperly opening the case, acid bath's the hard drive (preferably getting the platters)

Deadman switches for software logic bombs are also good ... such that if not reset by one of X individuals in X hours, the thing blows. Accessing the server in time of communications blackouts means POOF

the full encryption as well ... so power loss will help protect that, with the addition of say a USB Dongle in an acid well ... again. power loss equals USB dongle loss.. so the system couldn't unscramble.

Then you have to use procedural replacments ... every X days replace/reset passwords and keys, usb dongle attached to a string that lowers into the acid bath, like winding a grandfather clock.. chains & weights etc..