In this chapter, we successfully built a very powerful and flexible backup system for your code projects. You can see how simple it would be to extend or modify the behavior of these programs. The scope for potential problems that you could go on to solve is limitless.

Rather than having a local archive destination folder like we did in the previous section, imagine mounting a network storage device and using that instead. Suddenly, you have off-site (or at least off-machine) backups of those vital files. You could easily set a Dropbox folder as the archive destination, which would mean not only do you get access to the snapshots yourself, but also a copy is stored in the cloud and can even be shared with other users.

Extending the Archiver interface to support Restore operations (which would just use the encoding/zip package to unzip the files) allows you to build tools that can peer inside the archives and access the changes of individual files much like Time Machine allows you to...