feat(instance): handle sbs volumes in server backup

[Codelax]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 70.91%. Comparing base (5bf53e0) to head (23115b2).
Report is 321 commits behind head on master.

Files with missing lines	Patch %	Lines
...nal/namespaces/instance/v1/custom_server_action.go	37.50%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4248      +/-   ##
==========================================
- Coverage   75.45%   70.91%   -4.55%     
==========================================
  Files         202      294      +92     
  Lines       44323    65637   +21314     
==========================================
+ Hits        33444    46546   +13102     
- Misses       9653    17457    +7804     
- Partials     1226     1634     +408     

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