          02:00  o  Last backup    +
                 |                 | Data lost
          08:00  o  It fails       +                +
                 |                 | Recovery time  | Maximum tolerable downtime
                 |                 |                |
                 |                 |                |
                 |                 |                |
                 |                 |                |
                 |                 |                |
                 |                 |                |
Next day, 08:00  o  Systems back   +                |
                 |                 | Work recovery  |
                 |                 |                |
                 |                 |                |
                 |                 |                |
Next day, 22:00  o  Working again  +                +
