Method Backup

ui/Services/Patching/Patcher.cs:807–821

(string path)

        }

        void Backup(string path)
        {
            var orig = path + ".orig";
            if (!File.Exists(orig))
            {
                // .orig: never overwritten; atomic copy avoids torn recovery point.
                FileUtils.AtomicCopy(path, orig);
                Log($"  Original saved to {orig}");
            }

            // .bak: rolling per-cycle backup; atomic copy avoids torn restores.
            var bak = path + ".bak";
            FileUtils.AtomicCopy(path, bak);
            Log($"  Backed up to {bak}");
        }

        // Bracket both backups before either write so partial states are recoverable.
        void BackupBoth(string firstPath, string secondPath)