Facebook said on Thursday it was acquiring a company that helps protect the computers and data centres that power Internet services.

Facebook Inc. (FB) is acquiring PrivateCore, a startup that makes software for protecting data, to strengthen the security of its systems.

Terms of the deal weren’t disclosed. Facebook has been working to improve the security of its social network with encryption and the PrivateCore acquisition is part of the move to build up defenses, Chief Security Officer Joe Sullivan said in an online post.

Facebook saves everything its more than 1 billion users create, with its servers prioritizing saving a photo of dinner just as much as a photo of a wedding. In recent years, the company has taken more direct responsibility for all the data, moving much of it to servers the Menlo Park, California-based company designed itself.

PrivateCore, based in Palo Alto, California, was founded in 2012 by security veterans from Google Inc. and VMware Inc., according to the company’s website. The startup is backed by Foundation Capital

PrivateCore chief executive officer Oded Horovitz wrote in a blog post that joining with Facebook gives the company scale to let it pursue making the world’s connections more secure.