Obnam: excessively simplistic backup

Goal Today I'll start the journey towards backing up sets of files and restoring them. It will be a long journey, but I have hopefully built a bicycle to make it nicer than having to walk all the way. Specifically, today I want to create a "files database" to contain all the files and their metadata, and the IDs of chunks for their content. The file content will be backed up as chunks. The files…