pub/ pub/OpenBSD <----- You may want to start here. pub/OpenBSD/7.3 <----- Most recent release of OpenBSD pub/OpenBSD/snapshots/ <----- Most recent snapshots (current)
Replication from the master install file repository is every two hours.seventhree OpenBSD 7.3 release seventwo OpenBSD 7.2 release sevenone OpenBSD 7.1 release snapshots OpenBSD snapshots openbsd top of current pub/OpenBSD, with releases and snapshots