Apart from other people mentioning that distributed file systems have replication as a part of the architecture, Google also uses tape[1][2]. [1] - http://www.

Apart from other people mentioning that distributed file systems have replication as a part of the architecture, Google also uses tape[1][2]. [1] - http://www.tested.com/tech/1926-why-google-uses-tape-to-back-up-all-your-emails/ http://www.tested.com/tech/1926-why-google-uses-tape-to-back... [2] - http://www.theregister.co.uk/2013/12/29/a_year_of_tape_tittle_tattle/ http://www.theregister.co.uk/2013/12/29/a_year_of_tape_tittl...