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Textual representation of the crontab. User can customize the backup frequency and the backup version time using the cron expression. The version time must be in UTC timzeone. The backup will contain an externally consistent copy of the database at the version time. Allowed frequencies are 12 hour, 1 day, 1 week and 1 month. Examples of valid cron specifications: 0 2/12 * * * : every 12 hours at (2, 14) hours past midnight in UTC. 0 2,14 * * * : every 12 hours at (2,14) hours past midnight in UTC. 0 2 * * * : once a day at 2 past midnight in UTC. 0 2 * * 0 : once a week every Sunday at 2 past midnight in UTC. 0 2 8 * * : once a month on 8th day at 2 past midnight in UTC.