Backstop
Undo fidelity
Of every undo we've attempted, the share that restored the record exactly. Computed live from production plus our hermetic test corpus — a number a stranger can check, never a claim in a blog post. The bar is > 99%.
100.000%
meets the > 99% bar
1,012 of 1,012 attempted restorations landed exactly (sample: 12 production + 1,000 from the 1,000-sequence round-trip fuzz gate (docs/06)).
1,012
Attempted restorations
1,012
Restored exactly
12
From production
undo_fidelity = restored_exactly ÷ attempted. A refusal (conflict detected, handoff, unsupported) is not a failed restoration — we declined to guess — so it does not count against the number.
Protection coverage
A separate number: of writes we observed on connected platforms, the share that went through Backstop (and are therefore undoable). 33.3% — 1 of 3 observed (2 unprotected).