Used Snapshot to verify successful backup

[hossainemruz]

This PR has following changes:

• Fixed wipeOut flag in repository deletion
• Used Snapshot to verify successful backup

[codecov-io]

Codecov Report

Merging #447 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #447   +/-   ##
=====================================
  Coverage      84%    84%           
=====================================
  Files           2      2           
  Lines          25     25           
=====================================
  Hits           21     21           
  Misses          2      2           
  Partials        2      2

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