croncheck read all the files on this domain and compare it with different methods with the last report from the database. if you dont have a report there, it add's every file with link, date of the last changes, md5-checksum etc
in the next job, it add nothing, if you change nothing.
but if you add a (new) addon or other files or if you change the informations about the files on this domain (simple opening and save it's enough), the script register this new informations and add this file(s) at you last changes in the next report.
it makes no sense for me, to work with the croncheck on a local domain, where you maybe develop or test a lot of things. WBPortable has also no CronJob-function, so you have to start is manually