Can I archive an edit and come back to it later?

Yes. There are no exported files to keep or to make again. Archive the camera files, with their proxy files, and your editor project. When you come back, start Two Left Wheels 360 and open your editor project: the clips are there as before, with the same settings.

If the recordings are in another folder or on another disk now, their status shows Source missing. Click Find moved files… and point to the new location. See Manage editing packs and moved recordings.