Question: what can do to backup my system for a duration of 4 hours
Answer: Thank you for your inquiry,
The Lebert GXT4 UPSs can support up to 8 hours of uptime depending on the load and amount of external batteries. I strongly suggest this solution for your setup - the GXT4 units are designed for mission critical equipment like backup systems; The dual conversion feature eliminates all power quality issues such as noise, frequency, over and under voltage.
Lebert GXT4 UPS Systems
If you would like a recommendation based on your setup, please feel free to contact your Server Racks Online sales representative directly at 1-866-722-5776, at firstname.lastname@example.org, or via our online Chat functionality.