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If you're getting a UPS (good idea btw) watch out for the cheap chinese knock offs. Unreliable for a starter and the power surge protection is minimal at best. Plus they use crud batteries, short life and poor charging characteristics.
Pick a known brand, Eaton or APC are best in the consumer field, 500-750 watts. They have rated protection, decent batteries and well designed ( think safe ! ) electronics and converters. $100- $200 would probably be a price guess and it will last for 3-5 years before batteries need replacing.
My wife is the NZ 'guru' over here on UPS's and her company sees cheap chinese knockoffs regularly with short outs and failed componentry. She sells mostly Eaton hardware but is well known in the industry. The chinese stuff just gets binned, not worth fixing and parts are just about totally unavailable anyway.
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