Secure Software Back up Tool

Hello, im looking for someone to create a desktop application which can backup any files/folders from several places on a users computer. The system will be linked to a remote server. The user will have the option to back up daily, weekly or hourly. They can also decide what time the backup takes place. Once files have been backup up the system will only back up files if they have been changed. i.e saving space on the server. The user will also have the capability to restore any folders at any time with the latest files. The whole system must be 100% secure and password protected. Work my be sensitive. THanks