IAMbic wizard backups the config file prior to changes

[smoy]

Is your feature request related to a problem? Please describe.
When one is using the iambic setup to configure various iambic options, I would like to see backup files are created for the config, such that its easy to see what changes are made by the wizard.

Describe the solution you'd like
if the existing iambic config is on ~/iambic-config.yaml, when wizard needs to modify the config, it should first save a copy of original config to ~/iambic-config.yaml.backup-{datetime}. It is easier for me as the user to diff the two file to see how wizard is making changes to the configuration.

Describe alternatives you've considered
I need to create the git repository ahead of time to track changes committed vs uncommitted changes. However, if one makes multiple option changes in wizard, I only can tell aggregate changes. I like to see a backup file per change by the wizard.

Additional context
Add any other context or screenshots about the feature request here.

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