Security is important, and I have found that they have their clients covered. It is at the bottom of the Features > Details tab.
"Onehub provides role based authentication which means you can grant different levels of access to users as you choose. Plus, Secure Socket Layer (SSL) technology protects your information with server authentication, ensuring that your data is safe, secure, and available. Onehub is hosted in a SAS 70 Type 1 compliant data center that uses firewalls and other advanced technology to prevent interference or access from outside intruders."
"Onehub provides role based authentication which means you can grant different levels of access to users as you choose. Plus, Secure Socket Layer (SSL) technology protects your information with server authentication, ensuring that your data is safe, secure, and available. Onehub is hosted in a SAS 70 Type 1 compliant data center that uses firewalls and other advanced technology to prevent interference or access from outside intruders."
http://www.onehub.com/features/details#security