[{'role': 'user', 'content': "Analyze the following clause from a privacy policy and determine if it's fair or unfair. Also identify any privacy practices mentioned: A few final words on deletion: We can't guarantee that messages will be deleted within a specific timeframe. And even after we've deleted message data from our servers, that same data may remain in backup for a limited period of time. We also sometimes receive requests from law enforcement requiring us by law to suspend our ordinary server-deletion practices for specific information. Finally, of course, as with any digital information, there may be ways to access messages while still in temporary storage on recipients' devices or, forensically, even after they are deleted."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]