Considering the only supported way to deploy HipChat server is via virtual machine guest, the best way to get encryption at rest (and avoid the overhead of doing encryption on the guest) is by encrypting the filesystem that is used for the HipChat appliance on the virtualization host. The instructions to set this up are host OS and virtualization technology specific.
OVA format appliance can be deployed to either VirtualBox or VMWare hosts. If you use vSphere - https://www.hytrust.com/products/datacontrol/ is the add-on to implement encryption at rest. VirtualBox uses the host filesystem, so depending on the host OS you can use the native encryption software - i.e. LUKS for Linux hosts, Bitkeeper for Windows hosts, Filevault for OS X hosts.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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