Contact the author
The author of Tarsnap, Colin Percival, can be contacted...
- ... by email to firstname.lastname@example.org. (If desired, emails can be GPG-encrypted using Colin Percival's GPG key.)
- ... on twitter as @cperciva.
- ... on EFnet as cperciva.
Actually, he's cperciva pretty much everywhere; but those three are generally the best ways to contact him.
Feel free to send questions, comments, suggestions, and bug reports — Tarsnap development is driven largely based on feedback from users, and the more input you can provide, the better.