I've recently converted my archives of /n/sources/plan9 to Git and uploaded the repository on GitHub.
https://github.com/0intro/plan9 It contains the entire history of /n/sources/plan9, one commit per day, from December 12, 2002 to today, excluding the binaries and empty directories. I tried to make it as accurate as possible with the exact content, dates and permissions. Please let me know if you notice any mistake. I think this repository could be used as a reference for people interested in the history of Plan 9 or wanting to use it as a basis for their own changes. It could also be useful for people wanting to merge Plan 9 code in their projects like plan9port, vx32, drawterm and others. Have fun. -- David du Colombier
