https://forums.veeam.com/post140823.html?hilit=SharePoint%20site%20collection%20restore#p140823 - This post seems to say you can't do this
I'm not sure if the following means I could create a blank site collection and restore the snap shot over that or whether the backup can only be written to the site collection that snap was taken from.
Veeam Explorer for Microsoft SharePoint does not support creating new site collections. Therefore, you will be able to restore your sites to the existing site collection only.
Any clarification would be appreciated.
I don't currently have a test environment to try this and not keen to start messing about in our live environment.