The XML files in the data folder are the Job Logs.
However the job history - which includes the records in the lower pane of the job monitor screen along with the details that re shown on the Job History Tab when you review a completed instance of a job are part of the Becakup Exec database - so you wil need to restore an old database to get this informatiopn back.
If you only need the job logs then the XML files are good enough - except they won't be asscoiated into the BE console - because the Baxckup Exec Database contains the references to where they are - as such you will have to review them manully in Internet Explorer and accept that the formatting will bbe incomplete.