Getting empty folder when using mongodump to back up my MongoDB
I was using the default mongodb-client deb package with Ubuntu. I removed those and installed the mongodb-org-tools package from mongodb.com https://docs.mongodb.com/master/tutorial/install-mongodb-on-ubuntu/?_ga=2.36209632.1945690590.1499275806-1594815486.1499275806

They have other install instructions for your specific OS if you are not on Ubuntu https://www.mongodb.com/download-center?jmp=nav#community