Default weekly backups take place at 20 minutes past midnight on Sunday morning , as in the Cron Trigger
"0 20 0 ? * 1" contained in configuration key
schedule.weekly. See Section 4.11.14, “Config Editor” on how to change this
value. The following jobs are executed:
 The 20 minutes past midnight for the weekly job is chosen to avoid a potential performance bottleneck with server processes that occur exactly at midnight.