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The backend tells evidence about the files on your system.
The default backend should built/work on any machine. It is fully sufficient for most uses.
Other backends will be similar in features, but may offer more seamless integration with specific Desktop Environments like KDE or GNOME2.
The backend tells evidence about the files on your system. There are a several backends to choose from; for instance, if you are using KDE, the KDE-backend will let evidence use the awesome power of kioslaves. The GNOME-VFS backend does similar things for GNOME-users, the efsd-backend for enlightenment 17 users. If in doubt, use the default "file" backend which does not rely on a specific Desktop Environment and will run anywhere.