We have Ubuntu Server with Subversion installed on it. It makes automatic backups every week. And it doesn't connected to the Internet. Seems all OK with security. But one thing concern me — this server is in the room that accessed by a lot of people. Are there any solutions to protect valuable data from being physically stolen by someone? I mean something like some fast format device that could erase all data on server's HDDs if unauthorized person will try to extract these HDDs.
I know that ideal solution is to create standalone server room with restricted access, but it is too expensive yet.