By default the journals are kept in a folder, off the root install folder for Reporter.
The default install folders
Journals are rotated once their size reaches the size of about 5,212 KB. Once this trigger is reached, a new journal is generated. The journal named indicates the date, and time it was created.
NOTE: There is no way to manually trigger a rotation.
Journals can be configured for a non-default location, of your choice, by navigating to this place in the User Interface:
NOTE: The new journal will not be created untill a Reporter service restart is triggered.
NOTE: For information on how to read the journals, in Reporter, see 000014639