Option 1: A new documentation space
Use this option if...
you are starting a new documentation space, or
you have an existing space you will use as the draft, and will publish to a new space
Before choosing Publish you can
View Changes that are pending in each of the draft and the published spaces
Option 2: Adding to a populated space
Use this option if...
you have an existing space, on which people have comments, watched pages, etc
ANDyou need a draft space to which you can make changes, and when approved, will publish to your existing space
All the content on the populated space will be copied over to the Draft space.
Before choosing Synchronize, you can select Advanced options to manage the configuration for this initial copy process.
For example, you might need to consider unchecking Ignore Top-Level Pages to ensure the populated space home page and any other orphan or top-level pages are copied to the new draft space.