Fog Cam publishes one picture at a time and throws it away when the next one lands. Fog-Bank keeps every one of them, and when something goes wrong (on my side or Fog Cam's), the record shows exactly when, for how long and whose fault it was. Four catchers on three networks ask Fog Cam for its picture: a poller on my own server every 7 seconds, fogline on Cloudflare every 15 seconds (it keeps a 30-day buffer), a Cloudflare worker every 20 seconds that writes straight to permanent storage, and a machine at my house every 15 seconds.
Each one pushes every frame it gets into the archive, and sweeps every 5 minutes and every night pull back anything a push dropped. Every request asks for the real file (a unique query string plus no-cache headers), because in August I found Fog Cam's web server cache handing out copies minutes old. Each frame is named by Fog Cam's own upload time, fingerprinted with sha-256, stamped without re-compressing, stored as lossless JPEG XL and copied to Cloudflare R2 the same minute.
A status board checks every stage from the camera to YouTube every few minutes and pages me on Telegram when one stops. The page lists every outage so far, in order, marked as mine or Fog Cam's: Fog Cam's server outage on Aug 13, its 64-hour freeze on Sep 8 to 10, my server's 40-hour outage inside that freeze (a full disk), and the rest.
Source: Hacker News · Summarized by HeadlinesBriefing