fence or security checkpoints and has two reception areas

But its building in Bern Township, Pennsylvania, doesn't have a

Wide open with no checkpoints and no perimeter fence, this is one of the data storage sites run by the company that backed up Hillary Clinton's emails.

The facility owned by Datto Inc was part of the network that stored classified messages from the private email server the Democratic presidential candidate used as Secretary of State.

But unlike most government buildings, it is possible to walk to the front door without being challenged.

Daily Mail Online also saw employees from inside the building emptying trash into a dumpster that was kept open and unattended.

The disclosures will raise further alarm that Clinton's emails were not as secure as they would have been had she used her official email account while she was Secretary of State.

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'Data fortress': This is the building in Bern Township, near Reading, PA, run by Datto Inc which the firm describes in glowing terms. But it has no fence surrounding it and no checkpoints

Questionable claim: The company's claims of being a 'data fortress' are belied by the fact that no security guards were were on patrol on a recent afternoon

Insecure disposal: Material put in the dumpster could be easily removed by anyone wanting to look at it

Another open door: The facility lacks security guards at one of the loading bays. Datto shares the building with a trucking firm and a department store

Instead she set up a private server in her home in Chappaqua, New York which has now become the subject of two inquiries, one by Congress and the other by the FBI.

Datto was revealed by McClatchy last week as the company contracted by Denver-based Platte River Systems to back up Clinton's emails after she left office in 2013.

The report painted a picture of chaos, with Clinton's information accidentally being backed up to servers that it was not meant to be put on.

In its promotional literature Datto claims that its data storage sites are 'data fortresses' that are monitored 24 hours a day.

It claims that nobody can access the data without a retinal or palm scan.

But the reality at a sprawling, low-rise building on the edge of a four-lane highway in Bern Township, beside Reading, Pennsylvania, seems to be rather different.

Daily Mail Online's reporters confirmed through public records, Datto's own published material and inquiries that the building is one of its network of data storage sites.

The company shares the building with a number of other companies including Boscov's department store and transportation firm Penske.

Datto's servers are thought to be in the basement.

The site sits on a major intersection and is close to a gas station and a farm which has a high tower overlooking Datto's roof.

In charge: Austin McChord, the founder of Datto Inc, who likes to play in his offices with Nerf guns. He has seen his company expand rapidly

Workers: Datto Inc encourages its staff to be 'disrupters' in the data storage industry. As well as Halloween, they have dressed up for Cinco de Mayo and as Star Wars characters at a trade show last month

Under pressure: Hillary Clinton goes into tonight's Democratic debate with falling poll numbers and questions over trust, which have been fueled by the scandal over her private server. Now she faces questions over how top secret emails were stored by the firm which owns the facility whose security flaws are exposed today

There are two open entrances to the site from main roads connected by a thoroughfare - but there were no security personnel at either side, nor checkpoints or gates.

Security cameras are dotted around the building but they face down into the immediate vicinity and not out to the surrounding roads and fields.

On an afternoon last week no security vehicles were seen patrolling the facility.

Three separate employees were seen throwing bulging plastic bags into a grey metal dumpster left open just feet from the busy road.

At least three other dumpsters filled with garbage and full plastic refuse sacks were seen in the property parking lot too - all open as well.

The disclosures will put more pressure on Clinton who is being investigated by the FBI to see if her use of a private server breached rules on handling of classified data.

The congressional committee is focusing on what happened to the server after she left office in a controversy that is dogging her presidential run and harming her trust with voters.

In the latest developments it emerged that hackers in China, South Korea and Germany tried to gain access to the server after she left office.

It has also been reported that hackers tried to gain access to her personal email address by sending her emails disguised parking violations which were designed to gain access to her computer.

Daily Mail Online has previously revealed how a former senior executive at Datto was allegedly able to steal sensitive information from the company's systems after she was fired.

Hackers also managed to completely take over a Datto storage device, allowing them to steal whatever data they wanted.

Employees at the company, which is based in Norwalk, Connecticut, have a maverick attitude and see themselves as 'disrupters' of a staid industry.

On their Facebook page they have posed for pictures wearing ugly sweaters and in fancy dress including stereotypes of Mexicans.

Its founder, Austin McChord, has been called the 'Steve Jobs' of data storage and who likes to play in his offices with Nerf guns and crazy costumes.