The MongoDB Backup Service was introduced by 10gen in early May, initially as a Java project but later moved to Go due to its native compilation and strong standard library. The final implementation is written in Go, leveraging the mgo driver developed by Gustavo Niemeyer, which provides a great framework for accessing MongoDB through Go. The use of Go allows for lightweight syntax, first-class concurrency, and well-documented idiomatic libraries, making it an ideal choice for writing applications from small scripts to large distributed systems. The team appreciates Gustavo's work on mgo, which has been instrumental in providing a high-quality codebase with thorough documentation and a natural blend of Go and MongoDB APIs.