Today cloud storage start-up Nasuni announced it has secured $15 million in Series B funding, raising its total funding $23 million for the two rounds.  This round was led by early-stage venture capital firm Flybridge Capital Partners, with participation from North Bridge Venture Partners and Sigma Partners.

“The company has raised $23 million over two rounds on the promise of its file system virtual appliance that automatically distributes files between the cloud and a local cache.”

Nasuni Filer, the freely-downloadable cloud file server which runs as a virtual appliance provides companies with a new way to store their files. The appliance is now in its second version. It supports an array of cloud storage providers, as the idea of a local appliance controlling cloud and server data placement is growing, attention-wise and beyond.

Nasuni was founded in 2009, and for a relatively new start-up its pioneering Nasuni Filer has earned it $15 million in funding. It’s gone a long way since it first entered public beta, as Filer’s Rackspace Files, Nirvanix, EMC Atmos-based platforms and private cloud support enable the company to tap into a very large segment of the market. Nasuni Filer eliminates lengthy file server migrations and the need for backups, which provides prospective clients with a highlighted incentive which differentiates Nasuni from other start-ups, both from the client’s and the investor’s perspective.