I agree. The general computer backup system is not meant to actually run a computer for very long, only long enough for the user to save everything and do a safe shut down. I doubt it would run a CPAP longer than that.
Even less if the humidifier is on.
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But one point that many may be missing, is a UPS also *conditions* the current, meaning no spikes, sags, drops, etc... Ever see a light flicker? Ever see a light go dim for a moment (but not go out)? These kinds of conditions are very hard on higher end electronic devices, like computers, CPAPs, stereos, etc... but not so much washers, freezers, or toasters.
So, while it may only last 5-25 minutes (depending on battery size), even the smaller UPSs will handle the conditioning of your power to the devices. Which means a longer life, and less chances of an early failure.
*I* am not a DOCTOR or any type of Health Care Professional. My thoughts/suggestions/ideas are strictly only my opinions.
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There are two styles of UPS.
The more expensive is referred to as an 'On-Line' or 'In-Line' UPS. This type of UPS filters the mains, converts the mains to an intermediate level (while charging a battery) then regenerates a clean, regulated AC supply at the output. The output is, in effect, running off the battery and producing a constant voltage all the time so there is absolutely no glitch when the input mains fails. The better quality In-Line UPS also have a pure 'Sine-wave' output.
The cheaper choice is a simpler 'Line-Interactive' or 'Stand-by' UPS. The stand-by UPS simply passes the unregulated input mains through some filtering and surge suppression (but no regulation) to the output whilst also charging a battery. When the mains fails there is a either a relay or an electronic switch to connect the battery supply through an inverter. This can cause a small glitch although that is usually not a problem.
The reality is that there is probably little benefit in spending the extra for the In-Line UPS since the power supply for a CPAP machine is generally a well engineered item with good tolerance to minor mains voltage variations.
What the OP fails to mention is which model APC he is using. Some are rated at 350 VA others at 1500 or more. Some have external battery packs available to stretch for hours. An APC SU750XL might run an 80 watt power brick for 2 hours. I have been using the APC UPS for years with computers. They are very reliable.