Goldman Sachs' backing of cloud document sharing company Dropbox comes in the same year it helped social networking company Facebook raise $1.5bn.

US-based bank Goldman Sachs was one of the backers of Dropbox, a US-based cloud internet company, which raised $250m yesterday.

Goldman’s role on the Dropbox deal, follows it securing high profile investor stakes and fundraising roles for other start-ups. It helped social networking company Facebook raise a $1.5bn round at a $50bn valuation in January.

The US-based bank was joined by venture firm Index Ventures, which led the round, as well as venture and private equity firms Benchmark Capital, Greylock Partners, Institutional Venture Partners, RIT Capital Partners and Valiant Capital Partners.  The latest round values Dropbox at $4bn, according to UK news provider Financial Times.

Sequoia Capital, Accel Partners, Hadi and Ali Partovi also joined the round, taking the total venture funding raised by Dropbox since inception to $257.2m.

Dropbox said it now had more than 45 million users who save one billion files every three days, and was expected to triple its user base this year.

Dropbox was founded in San Francisco in 2007 by Drew Houston and Arash Ferdowsi.