Last night at 2:40 AM UTC, an OVH data center caught fire. No-one was harmed, but thousands of servers were lost. Here's how the disaster affects Lichess:
- Puzzles, Puzzle Storm, game GIF exports and push notifications went down, but we restored them
- Opening explorer is down, it might take a couple days to get it back, since it contains terabytes of data
- 24h of puzzle history was lost as we restored a backup from another data center.
Apart from that, we're fine and operating as usual. This incident doesn't put Lichess at risk, and doesn't weaken it in any way.
A data center is a building where thousands of servers run and power websites. Lichess rents many servers, which are spread in several data centers, so we always have backups when an incident like this happens.