What role and permissions does the ServiceNow user account for SnowMirror need?
SnowMirror needs to access ServiceNow using an user account having access to web services API. We strongly recommend using admin rights for such a user. It is much more simple to configure SnowMirror this way. Remember, SnowMirror has to access not only the data but meta-data about tables and columns too. Normal user account usually do not have such a permission level anyway.