How to export all collections in MongoDB?

Question

I want to export all collections in MongoDB by the command:

mongoexport -d dbname -o Mongo.json 

The result is:
No collection specified!

The manual says, if you don't specify a collection, all collections will be exported.
However, why doesn't this work?

http://docs.mongodb.org/manual/reference/mongoexport/#cmdoption-mongoexport--collection

My MongoDB version is 2.0.6.

Answer 1

For lazy people, use mongodump, it's faster:

mongodump -d <database_name> -o <directory_backup> 

And to "restore/import" it (from directory_backup/dump/):

mongorestore -d <database_name> <directory_backup> 

This way, you don't need to deal with all collections individually. Just specify the database.

Note that I would recommend against using mongodump/mongorestore for big data storages. It is very slow and once you get past 10/20GB of data it can take hours to restore.