DiRT works fine with exchange 5.5 and 2000 to back up cisco unity information , Unity's most of data is saved in this process. This includes all subscriber data, call handlers, interviewers, voice names, greetings, passwords, switch configuration information, etc optionally you can backup report data and subscriber messages as well. Only some specific items and settings are not preserved during the restore process. you use the following link for more information

http://answermonkey.net/App_DisasterRecoveryTools.htm