Deciding what to back up is a tricky thing and can differ a lot depending on the user. Most personal backup solutions are designed for people who have most of their work in medium-sized files stored in a handful of folders on their computers such as office documents, some photos, etc.
Underscore Backup is designed for tinkerers who tend to fiddle on their computers all over the place and for whom it would be too time-consuming and error-prone to try to keep up with what changes you made ahead of time so aims to back up everything, big or small. It also allows you to have full control of your retention of historical changes and deleted files.
This might sound strange, but I can personally remember several times when I realized a few months after upgrading my computer that I wished I had remembered to copy that one file off of the old computer where I had tweaked an obscure settings somewhere to make it do something I wanted. To solve this the entire storage methodology for the application is specifically designed with multiple different storage techniques supported which will be chosen automatically depending on the data to support both millions of very small files and a few very large files (Several TB are no problem, once you start getting to PB it is not entirely efficient but could be easily extended if the need arises). It can also obviously handle any combination of the two, for instance, I have a single server where I store many large media files as well as several hundred thousand files of router packet logs.
Because of this, the default settings for Underscore Backup will back up everything in your home directory with a few explicit exclusions which are known to be very unlikely to contain useful data (Such as the browser cache folders for instance). Due to its efficient file handling, it can do this without causing your backup size to balloon excessively and still allowing you to efficiently browse, search, and restore any data you want.
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