Is it worth getting a battery backup for a garage door opener?

Yes, if you rely on the garage as your main entry. A battery backup lets the opener run a few cycles in a power cut, so you are not forced to use the manual release. It is optional on many openers. A power cut can leave you stuck outside or inside, so a backup avoids the manual release.

A battery lasts for a limited number of cycles and needs replacing after a few years, so ask about its life when you choose it.

See garage door openers.

To get an accurate quote, send the opening width and height, the headroom above it, the style you want and a photo of the garage from inside. Mention your community in case it has door rules.