My 6X16 at home has a APC 800 or 850 on it and I have never had to reprogram after power outage. Befor APC back up I reprogramed every time power went out. (6X16 not good internal Battery)
The internal caps are good for 4-8 years, depending on how clean the power is on site. I have had customers with 6X16's for 10 years with no data loss!
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