A post from Cursor about Continuity, the Git storage system they built to host repositories at real scale. Instead of treating each repo as one precious copy on one disk, every push goes to a write ahead log in S3 first, and the client only hears back once that write is durable. Local disks become warm caches that can be rebuilt at any time, and replicas stay in sync with gossip over UDP plus conditional reads against S3. The post also covers repacking without making every replica redo the same expensive work, and gives real numbers: about 120 pushes a second on standard S3 and over 300 on S3 Express One Zone.