Thank you David.
I've studied the hundreds of my purged files more carefully. They are files that I moved from iCloud Drive to Office 365 Onedrive using the Mac Finder (drag and drop). The files themselves were not edited or even opened. Cloudberry purged files from the first location and backed them up after they arrived in the new location. Users may want to know if this is intended behavior. I had expected that the files at the first location would have been archived (or retained) in the Cloudberry backup and not purged since my retention policy is "keep 4 versions".