Back up for power outages

I've had sleep apnea for a few years now and am beginning to think about what to use for power outages. Better late than never I guess!
I am Canadian, as you can see, so maybe Canadian members would be able to offer more ideas.
What do you use for backup? I have been looking at something recently. It is made by Noma and is called a "Backup Power System", sold at Canadian Tire. It says it automatically switches on to keep devices and appliances running seamlessly. The smaller system is 400W and says it will run office devices for up to 8 hours. The larger is 1800W and is supposed to run office devices for up to 12 hours and kitchen appliances for up to 4 hours. I would probably only be using it for my CPAP. Canadian Tire also offers some other types of units. I talked to my provider and he said it depends upon the amps total for my CPAP machine and the humidifier, as far as size goes. Is this what I should look at? What does anyone think? Are there other things I could get that are available in Canada?

Don't know why I came in as "Guest" on this post. It's Hawthorne and I am in Canada.

You most likely need a UPS that is "Allways On". It conditions power as it is fed to the device and if there is a power interruption, it continues to provide power using the built in battery.

I have no idea what the wattage of a Cpap machine is, but would guess it to be fairly low compared with say a Computer, or other appliance.

Perhaps in the 25-50 watt range. (450w used at 50w would be aprox 9hours).

If so, a normal UPS that stays on all the time which are commonly in the 460watt range, would run something like that for several hours.

Then you need to consider how often and long your power outages last.

Here, they are mainly during the summer and last less than 10 - 15 min.

I would assume that distributors of these devices have solutions available. I have noticed that some have battery connections as well which might be a less expensive and longer term method.