Windows Server doesn't automatically clean any of its web log files, and can grow to 100+ GB in size.
While it is possible to use health monitor or other monitoring toools to keep an eye on disk space you do not want your backups or apps failing due to a log file being too large.
at 12:00 /EVERY:Su Forfiles.exe -p C:\WINDOWS\system32\LogFiles\W3SVC1 -m *.log -d -30 -c \"Cmd.exe /C del @path\"