Investigators believe they will be able to recover some of the data that once resided on Hillary Clinton's private server despite the former secretary of state's attempts to wipe it clean.

FBI officials "will try to figure what's there, how it got there and who put it there" as they examine the server Clinton handed over last week, according to a report by NBC News.

An attorney for Platte River Networks, the technology company tasked with managing Clinton's emails since 2013, told the Washington Examiner that the server contained no useful data because its contents were migrated — or electronically transferred — onto another device in mid-2013.

But the FBI's optimism that it can extract at least a portion of the data that was stored on the server could deepen an already growing investigation into the Democratic presidential candidate's controversial email practices.

After the intelligence community inspector general discovered "top secret" emails among a small sample, the Justice Department took into custody both Clinton's server and a thumb drive that contained copies of her work-related emails.

Clinton has said she "chose not to keep" roughly 30,000 emails she and her staff deemed unrelated to government service. However, concerns over the contents of the deleted emails have grown with the discovery that many of her records contained sensitive information.