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- Create BackupDirectory utility class with centralized: - DEFAULT_RELATIVE constant and PLACEHOLDER constant - resolve() — path resolution with [DEFAULT_DIR] and relative path handling - hasPlaceholders() — check for unresolved placeholder tokens - isWebAccessible() — web-root boundary check - protect() — .htaccess and index.html creation with error logging - ensureReady() — mkdir + protect in one call - parseNewlineList() — newline-separated text parsing - logPathFromArchive() — derive .log path from archive path - Remove duplicated methods from BackupEngine, SteppedBackupEngine, ProfileTable, AjaxController, and DashboardModel - All consumers now use BackupDirectory static methods - Net reduction: ~180 lines of duplicated code eliminated