Create Unit Tests of `backUp()` and Any Util Code

[ReedClanton]

Description

100% coverage of backUp() and any util code. Doesn't include CI/CD implementation (that's covered by #42).

High Level Solution Description

100% unit test coverage of relevant CUT and any util code using shellspec.

Alternative Solution(s)

None.

Blocked By

• Make backUp() not Bad... #22
• Convert Unit Test Library from bash_unit to shellspec #23

Blocking

• CI/CD | Run backUp() Unit Tests #42

Related Issue(s)

• Convert Unit Test Library from bash_unit to shellspec #23
• Create Unit Tests of shellName() and Any Util Code #32
• Create Unit Tests of log() and Any Util Code #36
• Create Unit Tests of output() and Any Util Code #38
• Create Unit Tests of checkRequiredOpts() and Any Util Code #40

Additional Context

I need to do #22 prior to doing this because that will likely change a lot. Although I could do them in parallel.