There are no command line options for KBACKUP .
Well, in fact, there are, but they are not meant to be used by you. In order to recognise what to do when called in scheduled operation mode, atrun(8) calls it with some options. You might, however , use them to perform a scheduled operation if your at(1) / crond(8) does not work. Have a look at the source to see what they do.
(e.g. kbackup --scheduled-backup .--scheduled--1234 to perform the scheduled backup number 1234)