Using Congregate for Piecemeal Migrations


I am inquiring concerning the use of Congregate for piecemeal migrations from a GitLab self-hosted instance to I noticed that according to the documentation located here that a command to populate a .json file with all repository information and MongoDB entires is achieved with ./ list If I have a self-hosted Gitlab instance with 95,000+ repositories, is that command needed and if so will it proceed to copy everything from the instance into the container that Congregate is running from? Would there be a way of migrating projects from a larger instance like this using the utility that side steps this command and imports only a few projects at a time with associated groups/users without pulling everything in at once perhaps?