First you need to spin up meteor.
Then if you run
meteor mongo
you will get an output something like this:
MongoDB shell version: 2.2.1
connecting to: 127.0.0.1:3001/meteor
Meteor db host is at 127.0.0.1 with a port of 3001.
Exit the mongo shell and use mongodump from your terminal.
mongodump -h 127.0.0.1 --port 3001 -d meteor
Dumps will be located under the dumps folder in the folder you executed the above command.
You can import your db back to meteor with
mongorestore -h 127.0.0.1 --port 3001 -d meteor dump/meteor
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