. How can I archive old projects or old versions of current projects?

Use the SSARC and SSRESTOR programs. Version 6.0 has a GUI interface to these programs making them easier to use. Also, be careful when restoring to a database that was created by copying an existing database and then deleting all files and projects in it: Read Q176780 - Use Guidscan.exe to View or Change GUID in a VSS Database.