Local

Dump

mongodump -d <database_name> -o <directory_backup>

Restore

mongorestore -d <database_name> <directory_backup>

Remote

Dump

mongodump --uri <uri_string> -o <directory_backup>

Restore

mongorestore --uri <uri_string> <directory_backup>

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.