yes, I can but for the same cost can I get a better back up
i doubt it... You will need to compare the ah rating of the Vortech backup to the UPS you are buying.
Plus the vortech battery backup switches the pump to DC and reduces the flow to 50% to allow increased run time when the power goes out. Using a UPS may not do this.
If you decide to go with Tunze, the new ones have battery backup available. You buy the the "Safety Connector" for $50 and it allows you to hook up to any DC power source. When the power goes out the safety connector will automatically switch over to the DC source and run the pump at 50%.
For my Tunze 6101, i got the Tunze Safetey Connector, a 55ah Sealed Lead Acid Battery, and a float charger. For about $150 total. I have 55+ hours of run time in the event of power loss. When the power comes back, the float charger recharges the battery for the next power loss event.
This will not work on the older Tunze pumps because they are not DC motors. The modified sine wave that a UPS creates will damage the AC motor according to Tunze.