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diff --git a/updater/sql/mac/src/backup.h b/updater/sql/mac/src/backup.h
deleted file mode 100755
index b894aca..0000000
--- a/updater/sql/mac/src/backup.h
+++ /dev/null
@@ -1,209 +0,0 @@
-#ifndef NODE_SQLITE3_SRC_BACKUP_H
-#define NODE_SQLITE3_SRC_BACKUP_H
-
-#include "database.h"
-
-#include <string>
-#include <queue>
-#include <set>
-
-#include <sqlite3.h>
-#include <napi.h>
-
-using namespace Napi;
-
-namespace node_sqlite3 {
-
-/**
- *
- * A class for managing an sqlite3_backup object.  For consistency
- * with other node-sqlite3 classes, it maintains an internal queue
- * of calls.
- *
- * Intended usage from node:
- *
- *   var db = new sqlite3.Database('live.db');
- *   var backup = db.backup('backup.db');
- *   ...
- *   // in event loop, move backup forward when we have time.
- *   if (backup.idle) { backup.step(NPAGES); }
- *   if (backup.completed) { ... success ... }
- *   if (backup.failed)    { ... sadness ... }
- *   // do other work in event loop - fine to modify live.db
- *   ...
- *
- * Here is how sqlite's backup api is exposed:
- *
- *   - `sqlite3_backup_init`: This is implemented as
- *     `db.backup(filename, [callback])` or
- *     `db.backup(filename, destDbName, sourceDbName, filenameIsDest, [callback])`.
- *   - `sqlite3_backup_step`: `backup.step(pages, [callback])`.
- *   - `sqlite3_backup_finish`: `backup.finish([callback])`.
- *   - `sqlite3_backup_remaining`: `backup.remaining`.
- *   - `sqlite3_backup_pagecount`: `backup.pageCount`.
- *
- * There are the following read-only properties:
- *
- *   - `backup.completed` is set to `true` when the backup
- *     succeeeds.
- *   - `backup.failed` is set to `true` when the backup
- *     has a fatal error.
- *   - `backup.idle` is set to `true` when no operation
- *     is currently in progress or queued for the backup.
- *   - `backup.remaining` is an integer with the remaining
- *     number of pages after the last call to `backup.step`
- *     (-1 if `step` not yet called).
- *   - `backup.pageCount` is an integer with the total number
- *     of pages measured during the last call to `backup.step`
- *     (-1 if `step` not yet called).
- *
- * There is the following writable property:
- *
- *   - `backup.retryErrors`: an array of sqlite3 error codes
- *     that are treated as non-fatal - meaning, if they occur,
- *     backup.failed is not set, and the backup may continue.
- *     By default, this is `[sqlite3.BUSY, sqlite3.LOCKED]`.
- *
- * The `db.backup(filename, [callback])` shorthand is sufficient
- * for making a backup of a database opened by node-sqlite3.  If
- * using attached or temporary databases, or moving data in the
- * opposite direction, the more complete (but daunting)
- * `db.backup(filename, destDbName, sourceDbName, filenameIsDest, [callback])`
- * signature is provided.
- *
- * A backup will finish automatically when it succeeds or a fatal
- * error occurs, meaning it is not necessary to call `db.finish()`.
- * By default, SQLITE_LOCKED and SQLITE_BUSY errors are not
- * treated as failures, and the backup will continue if they
- * occur.  The set of errors that are tolerated can be controlled
- * by setting `backup.retryErrors`. To disable automatic
- * finishing and stick strictly to sqlite's raw api, set
- * `backup.retryErrors` to `[]`.  In that case, it is necessary
- * to call `backup.finish()`.
- *
- * In the same way as node-sqlite3 databases and statements,
- * backup methods can be called safely without callbacks, due
- * to an internal call queue.  So for example this naive code
- * will correctly back up a db, if there are no errors:
- *
- *   var backup = db.backup('backup.db');
- *   backup.step(-1);
- *   backup.finish();
- *
- */
-class Backup : public Napi::ObjectWrap<Backup> {
-public:
-    static Napi::Object Init(Napi::Env env, Napi::Object exports);
-
-    struct Baton {
-        napi_async_work request = NULL;
-        Backup* backup;
-        Napi::FunctionReference callback;
-
-        Baton(Backup* backup_, Napi::Function cb_) : backup(backup_) {
-            backup->Ref();
-            callback.Reset(cb_, 1);
-        }
-        virtual ~Baton() {
-            if (request) napi_delete_async_work(backup->Env(), request);
-            backup->Unref();
-            callback.Reset();
-        }
-    };
-
-    struct InitializeBaton : Database::Baton {
-        Backup* backup;
-        std::string filename;
-        std::string sourceName;
-        std::string destName;
-        bool filenameIsDest;
-        InitializeBaton(Database* db_, Napi::Function cb_, Backup* backup_) :
-            Baton(db_, cb_), backup(backup_), filenameIsDest(true) {
-            backup->Ref();
-        }
-        virtual ~InitializeBaton() override {
-            backup->Unref();
-            if (!db->IsOpen() && db->IsLocked()) {
-                // The database handle was closed before the backup could be opened.
-                backup->FinishAll();
-            }
-        }
-    };
-
-    struct StepBaton : Baton {
-        int pages;
-        std::set<int> retryErrorsSet;
-        StepBaton(Backup* backup_, Napi::Function cb_, int pages_) :
-            Baton(backup_, cb_), pages(pages_) {}
-        virtual ~StepBaton() override = default;
-    };
-
-    typedef void (*Work_Callback)(Baton* baton);
-
-    struct Call {
-        Call(Work_Callback cb_, Baton* baton_) : callback(cb_), baton(baton_) {};
-        Work_Callback callback;
-        Baton* baton;
-    };
-
-    Backup(const Napi::CallbackInfo& info);
-
-    ~Backup() {
-        if (!finished) {
-            FinishAll();
-        }
-        retryErrors.Reset();
-    }
-
-    WORK_DEFINITION(Step)
-    WORK_DEFINITION(Finish)
-
-    Napi::Value IdleGetter(const Napi::CallbackInfo& info);
-    Napi::Value CompletedGetter(const Napi::CallbackInfo& info);
-    Napi::Value FailedGetter(const Napi::CallbackInfo& info);
-    Napi::Value PageCountGetter(const Napi::CallbackInfo& info);
-    Napi::Value RemainingGetter(const Napi::CallbackInfo& info);
-    Napi::Value FatalErrorGetter(const Napi::CallbackInfo& info);
-    Napi::Value RetryErrorGetter(const Napi::CallbackInfo& info);
-
-    void FatalErrorSetter(const Napi::CallbackInfo& info, const Napi::Value& value);
-    void RetryErrorSetter(const Napi::CallbackInfo& info, const Napi::Value& value);
-
-protected:
-    static void Work_BeginInitialize(Database::Baton* baton);
-    static void Work_Initialize(napi_env env, void* data);
-    static void Work_AfterInitialize(napi_env env, napi_status status, void* data);
-
-    void Schedule(Work_Callback callback, Baton* baton);
-    void Process();
-    void CleanQueue();
-    template <class T> static void Error(T* baton);
-
-    void FinishAll();
-    void FinishSqlite();
-    void GetRetryErrors(std::set<int>& retryErrorsSet);
-
-    Database* db;
-
-    sqlite3_backup* _handle = NULL;
-    sqlite3* _otherDb = NULL;
-    sqlite3* _destDb = NULL;
-
-    bool inited = false;
-    bool locked = true;
-    bool completed = false;
-    bool failed = false;
-    int remaining = -1;
-    int pageCount = -1;
-    bool finished = false;
-
-    int status;
-    std::string message;
-    std::queue<std::unique_ptr<Call>> queue;
-
-    Napi::Reference<Array> retryErrors;
-};
-
-}
-
-#endif