custom backup extension list

[epi052]

closes #1029

Landing a Pull Request (PR)

Long form explanations of most of the items below can be found in the CONTRIBUTING guide.

Branching checklist

• There is an issue associated with your PR (bug, feature, etc.. if not, create one)
• Your PR description references the associated issue (i.e. fixes #123456)
• Code is in its own branch
• Branch name is related to the PR contents
• PR targets main

Static analysis checks

• All rust files are formatted using cargo fmt
• All clippy checks pass when running cargo clippy --all-targets --all-features -- -D warnings -A clippy::mutex-atomic
• All existing tests pass

Documentation

• New code is documented using doc comments
• Documentation about your PR is included in the docs, as needed. The docs live in a separate repository. Update the appropriate pages at the links below.
  • update example config file section
  • update help output section
  • add an example
  • update comparison table

Additional Tests

• New code is unit tested
• New code is integration tested, as needed
• New tests pass

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (a714825) 92.31% compared to head (ab9a3b0) 92.33%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/config/container.rs	73.68%	5 Missing ⚠️
src/event_handlers/outputs.rs	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1035      +/-   ##
==========================================
+ Coverage   92.31%   92.33%   +0.02%     
==========================================
  Files          63       63              
  Lines       12069    12103      +34     
==========================================
+ Hits        11141    11175      +34     
  Misses        928      928              

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