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At the moment the basic version does not support creating of multisite staging sites. Perhaps we will add this future even into our free version in the future.
The required disk space will generally be doubled when creating a staging site but the pro version has the possibility to symlink the uploads folder which contains all the images then this folder will not be duplicated. This is helpful if your server has only limited disk space.
@hebhansen please write all further pro related questions to https://wp-staging.com/contact-us-presale-and-premium-support/
All the best
René