Example:
1. Backup every day at  01:30:

2. Backup every Saturday at 02:00:

3. Backup on the 1st of every month at 00:30:

4. Backup at the end of every month at 23:45:

5. Backup every hour:

6. Backup at time intervals of 2 hours, beginning at:

7. Backup every 15 minutes:

8. Backup at time Intervals of 3 days, at 22:30 beginning from today: