how to clone databases on mongodb atlas
# Dump db to a local folder
mongodump mongodb://user:pwd@localhost/old_name -o ./dump
# Restore the db with the new name
# all'interno di dump ci saranno tutti i dump di ogni database
# lo specifico db lo raggiungi tramite ./dump/{db_name}
# se non hai user e psw ---> mongodb://localhost:port -d nome_db ./dump/{db_name}
mongorestore mongodb://user:pwd@localhost -d new_name ./dump/old_name
# Try this flag if you get an authentication error
--authenticationDatabase admin