Best to follow guides from MongodbCopy 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 🙂
What is the recommended form of backup for my forum
Might want to check out relevant "Back up your data" bits from the upgrade docs:
Ensure you've got all yer' bases covered.