fix: create backup file with random filename

[frostming]

Signed-off-by: Frost Ming [email protected]

Pull Request Checklist

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

Fix #3193

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.63%. Comparing base (7e0a8e6) to head (10f051f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3194   +/-   ##
=======================================
  Coverage   85.63%   85.63%           
=======================================
  Files         112      112           
  Lines       11213    11215    +2     
  Branches     2432     2432           
=======================================
+ Hits         9602     9604    +2     
  Misses       1098     1098           
  Partials      513      513           

Flag	Coverage Δ
unittests	85.43% <100.00%> (+<0.01%)	⬆️

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