You set up local and remote logging in the Logging page.

By default, the system rotates each log file every 24 hours or when the file size reaches one Gigabyte uncompressed. You can change this to rotate every week or month and you can rotate files based on size.

The automatic rotation of system logs deletes your oldest log file, labeled as Archived log #10, pushes the current log to Archived log # 1, and starts a new current-day log file.