Consider making backups of the files before writing formatted content

[sherter]

If an IOException occurs during writing the formatted content, or if the formatter itself changes the content in an unexpected way (see, for example, google/google-java-format#47), we might loose data. Since we will eventually recommend people to run the formatting task in a pre-commit hook, this could be very bad.

[saifali40]

Why don't you use svc or git?

[sherter]

I do! How exactly does that help?