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There are two sides to this question.  Firstly EXTEND7000 provides some valuable redundancy to an existing SCADA system. In the event of SCADA failure, EXTEND7000 will continue monitoring and issuing alert notifications. Secondly EXTEND7000 can itself be installed in a manner that provides high availability either using a server cluster with failover or with backup servers and data replication.

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A lot, because the system obviates the need for static control rooms and significantly improves resource utilisation.
Consider this example of what one customer experienced. 
Before EXTEND7000: Life in the dark with ordinary SCADA
The Programmable Logic Controller (PLC) detects a timeout on a specific photo sensor which is polled by the SCADA system and an alert notification is raised on the monitor in the control room. The control room operator calls an engineer on the radio telephone but they are busy on another fault, they call a second engineer who advises this needs a specific skill set, a third engineer is called and they are some distance from the fault but accept the call anyway. The engineer attends the fault and concludes the photo sensor needs replacing and goes to the unmanned stores for the part. They log onto a terminal and discover the part is in the alternative stores at the other end of the site. Finally arriving back with the part they fit it but it still isn’t working so the engineer calls the control room to read the PLC status. Eventually the fault is found to be in the wiring and the control room operator clears the notification. The engineer finally returns the part to stores.
With EXTEND7000: Real time information with Mobile SCADA and Mobile Maintenance
EXTEND7000 Mobile SCADA monitors the PLC and detects the photo sensor timeout. An alert notification is automatically sent directly to all appropriately skilled engineers working in the area of the fault.  A free engineer responds to the audible/vibration alarm, looks at the alert details on their mobile, and accepts the notification as it is close by so preventing other engineers from responding to the same call. To confirm it is the photo sensor, they select the option to read the PLC input on the mobile, complete some tests and diagnosis the fault is with the wiring. Had they discovered the sensor was at fault, the engineer could have used the Mobile Maintenance functionality to locate the spare part by scanning an attached barcode and created a Work Order to record the issue and return of spare parts. In this case they set the status of the notification to resolved and are prompted to select fault reason codes which are recorded in an archive along with time stamps for each activity for future management reporting and analysis.

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