Continuity of Cloud Back Up Sets between Clean Installs

I would like to put in a request for native ability to take an existing backup set and to allow updates to it after a re-install. Having to delete and re-back 30+ gigabytes is a huge pain. In a perfect cyber world, clean re-installs would not be necessary. Alas, they are. Could we see a more friendly backup app in the future?

 

Regards,

Ron