The request packet looks as follows:
<packet version="1.6.0.0">
<backup-manager>
<get-supported-protocols/>
</backup-manager>
</packet>
A positive response from the server looks as follows:
<packet version="1.6.0.0">
<backup-manager>
<get-supported-protocols>
<result>
<status>ok</status>
<protocol>ftp</protocol>
</result>
</get-supported-protocols>
</backup-manager>