I know there are two default groups, the name is administrator and global moderators (group system) but I do not accidentally delete a group global moderators (it should not be removed) how to I get it back ?

*Sorry if my grammar is bad

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Best to follow guides from Mongodb

Copy all the files in the webroot Use mongodump to backup your DB: https://docs.mongodb.com/manual/reference/program/mongodump/

Almost all data is saved in the DB except uploaded files 🙂