What FileGriffon is
FileGriffon is a background daemon that watches a drive or folder (a "vault") and cryptographically verifies your files over time. It flags corruption, missing files, and moved or renamed files, and can repair certain damage automatically using parity data. Everything runs locally — no cloud upload, no account required for the core features.
The idea: storage prices make "just buy a second drive and mirror it" a harder sell than it used to be. FileGriffon hardens the single drive you already have, at a fraction of the cost of buying redundant storage.