Box.net, an online file-sharing and storage platform, has raised $7.1 million in funding, per an SEC filing. Previous backer Draper Fisher Jurvetson led the round, with participation from U.S. Venture Partners. Box.net has raised $14.6 million in total, including a $6 million round last year, from the two VC firms. The company said it will use the money to fund “day-to-day operations.”

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Launched in 2005, Box.net offers pay-as-you-go, cloud-based file storage; it opened its platform to third-party apps from companies like Google, Microsoft and WordPress last year. It recently launched an iPhone-based storage program called OpenBox Mobile that lets users collaborate on projects and share data; BlackBerry, Android and Palm-based versions are slated for a later release.