Google recently enabled IMAP support for Google Chat conversations label.
And this has now enabled Backupify to start offering backup of these chat archives.
All you need to do is to enable IMAP support on your account for this particular label and Backupify would do the rest.
The company said:
Backupify now backs up Google Chats. Those of us who use gChat (remember when it was called Google Talk?) know it has become an important part of everyday business, be it asking a quick question to a co-worker, supporting a customer or locking down details with a partner. Having a record of these interactions can be very important to your organization. (And not just because you want all that intra-office fantasy football trash talk to be archived forever.)