How can Dart applications validate backup integrity before restoration?

When developing Dart applications that persist user data or application state, developers often need to create reliable backup and restore mechanisms. Ensuring that a backup can be successfully restored without corruption or data loss is a critical validation step, especially when targeting multiple platforms such as mobile, desktop, and web.

Constraints include platform‑specific storage APIs, the need to handle asynchronous I/O, and the desire to keep the validation lightweight so it does not impact runtime performance. Uncertainty remains about which Dart‑native packages or patterns provide automated integrity checks, and how to test backup/restore flows in CI pipelines.

What strategies can be used to verify the integrity of a Dart backup before restoring it? Are there established Dart libraries or patterns that automate backup validation across VM, JavaScript, and WebAssembly targets?