It uses a "chunked transfer" method. It doesn't need to load the whole file into memory. It breaks the 100GB into micro-pieces, ships them, and reassembles them on the other side.
WordPress is no longer just for blogs; it is for video libraries, LMS platforms, and digital download marketplaces. As your site approaches 100GB, you have two options: risk manual FTP hell or use . all-in-one wp migration 100gb