Note that a court could cite you for contempt for not complying with a subpoena duces tecum (a subpoena requiring you to produce objects or documents) if you fail to turn over subpoenaed backups.
Assume that your application is running (mirrored) on five machines in five different jurisdictions and the machines will lock out one or more of their number if they receive a panic code, or one goes offline unexpectedly, or is not accessed in exactly the right way, you could easily respond to a subpoena duces tecum by stating truthfully that the requested records are not (or are no longer) under your control. The machines themselves can also be protected by careful choice of location and judicious use of remailers and requirements that they only be accessed by telenetting, etc. Besides what's the big deal about contempt of court. If you are worried about doing 2 years or less, locate yourself in another jurisdiction. No need to expose your body to high risk legal regimes. Duncan Frissell "But your Honor, I'm desperately trying to *conceal* my contempt for this court."