Issue Summary

Allow an option to export multiple spaces in HTML or XML at a time to support Offline export of multiple spaces.

Steps to Reproduce

1. Go to Space Settings > Content Tools.

1. Select the Export tab.

1. Choose the export format. For offline backups, XML is recommended as it can be imported back into Confluence if needed.

1. Click Next and then Export. This will generate a downloadable file of your space content.

Expected Results

Option to select multiple spaces to export.

Actual Results

You can either export the entire site or only one space

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available. 
You have to export one-by-one.