Focus towards recovery rather than preemptive prevention; once medical immortality and mind-backups become available and routine, anyone who dies from "terrorism" and other violence or accident could just be resurrected.

Data, financial and whatnot, can already be restored. Architecture can already be rebuilt. Once nobody is able to inflict any lasting damage on society, everyone can just chill and maybe no one would want to try any terrorism, knowing how futile it would be.