pub/ pub/OpenBSD <----- You may want to start here. pub/OpenBSD/7.4 <----- Most recent release of OpenBSD pub/OpenBSD/snapshots/ <----- Most recent snapshots (current) archive/ <----- Snapshot Archive (for troubleshooting)
Replication from the master install file repository is every two hours.sevenfour OpenBSD 7.4 release seventhree OpenBSD 7.3 release seventwo OpenBSD 7.2 release snapshots OpenBSD snapshots openbsd top of current pub/OpenBSD, with releases and snapshots