Problem When trying to build a large package, the package build process fails. Strato has limitation that prevents a file from exceeding 1 or 2 GB. To get around this issue try the following:
Option 1 Contact Strato support and ask them to remove this setting on your server. Once they do this you should be able to build the package.
Option 2 Add non-essential directories or files to the file filter on the first build step, then manually move over those filtered files to the new location.
Option 3 Perform a 2-part install as explained here: https://duplicator.com/duplicator/docs/quick-start#quick-060-q