Someone got access to the full tape backups for two warez BBSes (The WaREZ HouZE and Piper's Pit) and uploaded the tape images to archive.org: https://archive.org/details/ibm-wgam-wbiz-collection. The collection spans the late 1980s to the late 1990s.
These are _very large_, multi-MB zip files, indexing I think north of at least 100GB worth of files.