Switching Rackspace CDNs?

Hello,

We’re in the process of trying to switch Rackspace Cloud accounts, which means creating a new CDN container on the new account, and changing the credentials the W3TC to point to the new container. My question is, what can we expect to happen after doing this? Will the plugin immediately try to re-upload all of the assets to the new container? Are there any better techniques to try, such as manually copying the assets to the new container, and then switching the credentials (would this even work?)? We’ll be doing a full backup of the site files and database, but are there any other precautions that we should take before attempting this move? Thanks for your help.

https://wordpress.org/plugins/w3-total-cache/