Quicken Mac automatically backs up your data file before performing an update. It also moves the prior version of the application to your Trash, so you can retrieve it in the unlikely event you need to revert.
And of course, they don’t release updates nearly as often as you suggest. Since last June, there have been 5 feature releases and 15 bug fix updates— so 20 updates over the past year, or an average of one every 18 days. And you can skip installing an update when it prompts that a newer version is available.
After each major release, there are usually a few follow-on bug fix releases over the next several weeks - the previous 7.0 release went up to 7.0.4, so 4 bug fix releases for that one.
You can see the last several years of releases here.
AAAHHH for the days when users complained that updates didn't come out fast enough.