Betamax

Betamax was a type of human videocassette tape recording format avaliable from 1975. (REF: Doctor Who: The Encyclopedia) By the 21st century it was considered obsolete.

The Tenth Doctor stored the Wire on a Betamax tape in 1953 and claimed that he was going to record over it. (DW: The Idiot's Lantern)

In 1982, a Betamax video recorder fell through the Rift to May 2008. It was picked up by Torchwood Three and stored in the vaults.

When Harold had to get a message to Jack Harkness in 2009 about the Hokrala Corp, he made a Betamax recording. (TWN: The Undertaker's Gift)