Routes from older BaseCamp Backups

So,we are doing a 3 month tour of much of the USA. I didn't think too much about what I was doing as we traveled. I had originallycreated multiple routes and as we traveled I made changes and.at times, removed some of the old data, and created new backups as we moved along.
Any way I can get those routes from the older backups into my current BaseCamp routes?