According to users on the Acer forums, the Skydrive option is working fine. Maybe you are not logged-in on the service. Start Acer Backup Manager, then access the Settings menu, and make sure you are logged-in on SkyDrive, then the option will become available. Keep in mind that SkyDrive has a limitation to prevent very big files from being uploaded. Moreover, access the manual of the application where all the features of the application are explained.