Doppler secret snapshots provide a robust failsafe for legacy and on-prem environments where secrets must be fetched at runtime, offering high availability and protection in network-restricted environments or when Doppler's API rate limit is exceeded. By bundling secrets snapshots into the application build during CI/CD, applications can access their secrets even if Doppler's API is unreachable. The use of a passphrase ensures secure encryption and decryption of secrets, allowing for independent rotation of authentication tokens and passphrases. Secrets snapshots support name transformers and download formats, making it easy to integrate with existing build processes. With the addition of the `--fallback-only` option, applications can fall back to a specific secrets snapshot when running in production, ensuring high availability even in case of API issues.