

Not selfhosting, but I remember standing in a server room with a hands’ width of water on the ground (and rising), and hastily shutting down servers where the water was already in the case. It were big towers (Compaq Proliant, if anyone remembers), and luckily the board, drives, and PSU were in the top part of the big tower cases, the drive bays at the bottom were empty.
We got all equipment out safely, and we did not get electrocuted, either. We left with the last equipment when the water level was approaching the knees.

The “faucet” was water literally streaming in through the broken window during a thunderstorm. One of my coworkers went outside and shielded the window with a wooden board to reduce the flow.