What happens to an archived project? Can it be restored to active status at a later date?
Yes, it can. If you archive a project, you can access it anytime by clicking on the "Show archived projects" link at the bottom of your projects list and then either left-clicking on the project to see its content or right-clicking on it and selecting "Unarchive" from the context menu which will put it back on the active projects list.
I don't seem to have the link at the bottom of my projects?
Please let us know which browser you are using, and if signing out and back in again resolves the issue. You may want to try clearing the cache for it as well.