[imasr]

On you own server you decide what and for how long data will be stored. In the government wants your server you can format your hard drive if you want (or whatever you think is fit). I bet you can't do that if your mail is on google (or yahoo, msn, etc for that matters)

[jrockway]

In the government wants your server you can format your hard drive if you want.

That is illegal and ineffective. Full-disk encryption provides much more safety, both legally and technically. (They could still sneak into your house and install a hardware keylogger that gets your encryption passphrase, and then seize the disks. But this is real life, not a movie.)

[johSho7w]

Well, they do have hardware to seize a running server without shutting it down (by splicing into the power cables/power lines at the wall plate and introducing battery power). How secure is a running machine sitting in a forensic lab? If you're receiving mail from the net your disk is necessarily unencrypted, right? I guess you would also need some sort of dead-man trigger. Suggestions?