nasbackup: improve error reporting during backup

[shwstppr]

Description

If any failure after backup job return the error and not just the backup job info, destination size.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.67%. Comparing base (8e933b7) to head (49af7e6).

Additional details and impacted files

@@             Coverage Diff              @@
##               4.22   #13426      +/-   ##
============================================
- Coverage     17.67%   17.67%   -0.01%     
+ Complexity    15792    15789       -3     
============================================
  Files          5922     5922              
  Lines        533167   533167              
  Branches      65210    65210              
============================================
- Hits          94246    94234      -12     
- Misses       428276   428287      +11     
- Partials      10645    10646       +1     

Flag	Coverage Δ
uitests	3.69% <ø> (ø)
unittests	18.75% <ø> (-0.01%)	⬇️

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