As an administrator performing site migration or backup tasks, I would like to be able to select a number of spaces and then export all of them to XML at once. I would thus like to be able to export multiple spaces at the same time, whether it be 2, 5, 50, or more spaces.

Currently, Confluence does not have a bulk space export method, but there are old APIs which service this: https://developer.atlassian.com/server/confluence/confluence-json-rpc-apis/ details a method to perform space export using deprecated RPC APIs, but this is not a contemporary way to perform the same task. Similarly, while there are third party tools which leverage these same older APIs, there is nothing in the front end which allows for bulk space exporting.