The Application folders page of the Options window (accessible from the File, Options menu item) contains general settings of the program.
Override settings folder
This is the folder where the program's settings are kept. You can use the Browse button to select an existing folder. By default this option is set to the "AppData\Roaming\Softland\Backup4all 8\" folder of your Window login account profile.
Override default destination folder
This is the folder used as destination for the newly created backup jobs. The existing backup job destinations will not be affected if you change this option (you have to manually change the destination for them). You can use the Browse button to select an existing folder. By default this option is set on the local partition with the most free disk space on your computer, under "My Backup4all\Username" folder.
Override temporary folder
This folder is used by the compression engine to handle compressed files (.zip). Only a full path is allowed. The recommendation is to set the temporary directory on the hard disk partition with the most free space available. You can use the Browse button to select an existing folder. By default the option is set to the operating system's temporary folder.