This is documented in Who can view chat history in HipChat Server - depending on the scope of your question, there are two main aspects:
Chat history, messages, and files details the operator point of view - chat messages in general are stored in HipChat Server's virtual machine in the
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Background While our Hipchat server environment was reliable and performing well, as a significant and growing part of our business, the need to leverage the benefits of Hipchat Data Center&nbs...
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