To add files which you would like to backup to your project, use the Backup Wizard.
You can open it either via the Project menu or in the project toolbar via the Backup button. Furthermore, the wizard will automatically open, once you drag a file via drag& drop into the project.
In the list you see the files which are to be added to your project and backed up. Using the Add Folder button you can select folders to add. Single files can be selected via the Add Files button. Via the Delete button you can remove single items from the list.
Note: Only checked items will be added to your backup.
To start the backup immediately leave the option Process backup immediately checked. In case you only like to add items to your project for now uncheck the check box. By clicking Next you will start the process and AceBackup will add the files to your project.