Imports

Miraheze provides imports for all wikis. To request an import please phab>phab:maniphest/task/edit/form/7/|create a Phabricator task with a title of 'Import for [your wikis name]' replacing the name with a link to your wiki and attaching or linking an XML dump. Please note that if the dump is bigger than 10 MB, you need to use a cloud provider (like e.g. Google Drive or Dropbox). If it is a private wiki you can send this by email to tech@undefinedmiraheze.org. You can read docs>Special:MyLanguage/Moving a wiki to Miraheze|Moving a wiki to Miraheze if you need help creating a dump file.

Technical side
Imports are done by the sysadmin>Special:MyLanguage/System administrators|System administrators. They are done using the importDump.php and importImages.php maintenance scripts. The duration of the import depends on the size of the wiki.