Update backup-cluster.md

[echapman13]

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[rahulbabu95]

/ok-to-test

[rahulbabu95]

/retest

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.63%. Comparing base (0238d2e) to head (f92dc81).
⚠️ Report is 25 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10028   +/-   ##
=======================================
  Coverage   68.63%   68.63%           
=======================================
  Files         679      679           
  Lines       51095    51095           
=======================================
  Hits        35067    35067           
  Misses      14253    14253           
  Partials     1775     1775           

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