http://treasurechest.i2p/tidings.html
So I cut a regular SATA power connector off a dead power supply, grabbed a soldering iron, and well, if you're reading this it means it worked. The other thing to do was to set up some monitoring. We care about privacy around here, so I kept it safe and simple: a program checks that the vault's physical host is up, that the VM and the I2P daemon are running, and that the vault's services (HTTP and SFTP) are listening, and if any of those tests fail I get a warning.