I’m using expression engine 1.6.9, build 20100430.
The other cron things are cache clears. I can’t tell if they work or not. As I type this, the sql_cache and db_cache folders, and all the items inside those folders, are dated January 27.
The entire listing of cron items, including db_backup is as follows:
{exp:cron minute="0" hour="5" which="db_cache" plugin="cron_clean_cache"}{/exp:cron}
{exp:cron minute="05" hour="5" which="sql_cache" plugin="cron_clean_cache"}{/exp:cron}
{exp:cron minute="10" hour="5" which="tag_cache" plugin="cron_clean_cache"}{/exp:cron}
{exp:cron minute="15" hour="5" which="page_cache" plugin="cron_clean_cache"}{/exp:cron}
{exp:cron minute="20" hour="5" which="world_weather_cache" plugin="cron_clean_cache"}{/exp:cron}
{exp:cron minute="25" hour="5" which="moblog_cache" plugin="cron_clean_cache"}{/exp:cron}
{exp:cron minute="55" hour="4" plugin="cron_blacklist"}{/exp:cron}
{exp:cron minute="0" hour="3" plugin="cron_db_backup" prefix="bu_ALL_daily"}{/exp:cron}
{exp:cron minute="15" hour="3" plugin="cron_db_backup" prefix="bu_entries_daily" tables="exp_weblog_data|exp_weblog_titles"}{/exp:cron}