Add Retention policy

[Minituff]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 96.15385% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.30%. Comparing base (828c62a) to head (4229459).

Files with missing lines	Patch %	Lines
app/backup.py	95.74%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #670      +/-   ##
==========================================
+ Coverage   91.70%   92.30%   +0.59%     
==========================================
  Files           9        9              
  Lines         989     1091     +102     
==========================================
+ Hits          907     1007     +100     
- Misses         82       84       +2     

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