/usr/share/doc/system-tools-backends/README is in system-tools-backends 2.10.2-3+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | to extract the configuracion
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backend --get
to restore the configuration from XML
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backend --set < file.xml
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