There are a number of tips which can improve your Tarsnap experience.
For more advanced users, the Tarsnap man pages are available.
For advanced users and the generally curious, a variety of technical details about Tarsnap are also available.
There are a number of third-party helper scripts to automate backups, backup rotation, and integration with software development tools.
A number of miscellaneous questions are answered in the Tarsnap FAQ.
Looking for something you think should be documented but isn't? Please contact the author so that it can be added here.