Comprehensive and detailed guides provide information about Zmanda Cloud Backup release. The offline documentation is also available from the ZCB UI (Help>Getting Started, Help>FAQ)
Zmanda Cloud Backup 4.0 Release notes
Zmanda Cloud Backup 3.0.2 Release notes
Zmanda Cloud Backup 3.0.2 Getting Started Guide (PDF)
Zmanda Cloud Backup 3.0.2 FAQ (PDF)
Zmanda Cloud Backup 3.0.2 Service Pack 1 (for backups to Amazon Japan/Tokyo location)