Fix gateway backups

[Pierre-Gilles]

Pull Request check-list

To ensure your Pull Request can be accepted as fast as possible, make sure to review and check all of these items:

• If your changes affects code, did your write the tests?
• Are tests passing? (npm test on both front/server)
• Is the linter passing? (npm run eslint on both front/server)
• Did you run prettier? (npm run prettier on both front/server)
• If your changes modify the API (REST or Node.js), did you modify the API documentation? (Documentation is based on comments in code)
• If you are adding a new features/services which needs explanation, did you modify the user documentation? See the GitHub repo and the website.
• Did you add fake requests data for the demo mode (front/src/config/demo.json) so that the demo website is working without a backend? (if needed) See https://demo.gladysassistant.com.

NOTE: these things are not required to open a PR and can be done afterwards / while the PR is open.

Description of change

Please provide a description of the change here. It's always best with screenshots, so don't hesitate to add some!

[codecov]

Codecov Report

Merging #568 into master will increase coverage by <.01%.
The diff coverage is 27.27%.

@@            Coverage Diff             @@
##           master     #568      +/-   ##
==========================================
+ Coverage   91.72%   91.73%   +<.01%     
==========================================
  Files         381      382       +1     
  Lines        4675     4680       +5     
==========================================
+ Hits         4288     4293       +5     
  Misses        387      387

Flag	Coverage Δ
#server	91.73% <27.27%> (ø)	⬆️

Impacted Files	Coverage Δ
server/config/scheduler-jobs.js	100% <ø> (ø)	⬆️
server/lib/gateway/index.js	100% <100%> (ø)	⬆️
server/lib/gateway/gateway.checkIfBackupNeeded.js	11.76% <11.76%> (ø)
server/lib/gateway/gateway.init.js	52.94% <50%> (+27.13%)	⬆️

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