remove backup mechanism

[alisterburt]

this PR removes the backup mechanism as a fix for #72

@jojoelfe I went with removing here but please drop a comment if you'd much rather keep the backup mechanism - from my side I see it as useful for user facing applications but shouldn't be in a lower level utility like starfile

will merge if I don't hear back from you soon :-)

[jojoelfe]

Sure, sounds good

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.27%. Comparing base (5b19406) to head (9f7d5b4).
Report is 22 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
+ Coverage   80.93%   82.27%   +1.33%     
==========================================
  Files           7        7              
  Lines         278      299      +21     
==========================================
+ Hits          225      246      +21     
  Misses         53       53              

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