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 81.25000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 70.99%. Comparing base (5bf53e0) to head (519c04b).
Report is 340 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/namespaces/instance/v1/custom_image.go	77.50%	6 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4248      +/-   ##
==========================================
- Coverage   75.45%   70.99%   -4.46%     
==========================================
  Files         202      294      +92     
  Lines       44323    66011   +21688     
==========================================
+ Hits        33444    46866   +13422     
- Misses       9653    17505    +7852     
- Partials     1226     1640     +414     

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