If you are familiar with vcs software such as Subversion, you might think of boar as "version control for large binary files". But keep reading, because there is more to it.
Boar stores snapshots of directory trees in a local or remote repository and provides tools to ensure that your data is consistent and complete. You can keep just some or all of your data checked out for viewing and editing.
The repository has a simple layout to ensure that the data can easily be extracted even if the original software should be unavailable. This simplicity makes boar ideal for data that needs safe long-term storage.