There's two things most of us have done to make things future proof as possible.
First is to use Command center and make all the little lights go green.
Then copy the CCC download folder to multiple back up locations.
The CCC download folder is found in C/Product Data/Cakewalk/ Command center
THEN I would also go directly to your MY Products Page and download EVERYTHING as well as make screen shots or copy paste all the serial numbers for each product. Copy these as well to multiple locations.
Some of the Plug ins and libraries etc in there can be used with other DAW's but you'll need those serial numbers to install them later.
You might also want to install as many copies of Sonar as you have available computers and make sure they are fully authorized.
At this point we have no guarantee that we will be able to install Sonar to a new computer in the future. The servers could be shut down at any time even though we've been promised this won't happen. Once they are shut down they will be no way to authorize new installs of Sonar. You can have as many copies of Sonar as you have computer as long as you and only you use one at a time.