Explicitly create nested subdirectories on export

[isc-pbarton]

Fixes #786

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.91%. Comparing base (d5fa0d9) to head (a6eaee5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #942   +/-   ##
=======================================
  Coverage   50.91%   50.91%           
=======================================
  Files          23       23           
  Lines        3131     3131           
=======================================
  Hits         1594     1594           
  Misses       1537     1537           

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