The following are the minimum permissions in SQL Server required for users if connecting via NT Authentication:
Permission needs to be provided on the instance level by your SQL Server Administrator. (Do not apply on the database level)
Tip: Permissions can be managed in SQL Server via Active Directory Group or by providing individual permissions per user.
Required Permissions:
Server Roles - dbcreator and public (for Backup and Restore)
User Mapping - dbowner and public - for the EvolutionCommon and each Payroll database
The same minimum permissions are required for SQL Server Authentication.