mongodump --db mydb --gzip --out "mydb.dump.$(date +%F_%R)"
This command will dump a bson gzipped archive of your local mongod 'mydb' database to the 'mydb.dump.{timestamp}' directory
mongorestore --db mydb mydb.dump.2016-08-27_12:44/mydb --drop --gzip
This command will first drop your current 'mydb' database and then restore your gzipped bson dump from the 'mydb mydb.dump.2016-08-27_12:44/mydb' archive dump file.
