diff --git a/src/libslic3r/AppConfig.cpp b/src/libslic3r/AppConfig.cpp
index 6b1478e59a..4a00ce46df 100644
--- a/src/libslic3r/AppConfig.cpp
+++ b/src/libslic3r/AppConfig.cpp
@@ -286,7 +286,7 @@ void AppConfig::set_defaults()
     }
 
     if (get("backup_switch").empty()) {
-        set_bool("backup_switch", false);
+        set_bool("backup_switch", true);
     }
 
     if (get("backup_interval").empty()) {
diff --git a/src/libslic3r/Format/bbs_3mf.cpp b/src/libslic3r/Format/bbs_3mf.cpp
index 77d40d7667..d6d9110652 100644
--- a/src/libslic3r/Format/bbs_3mf.cpp
+++ b/src/libslic3r/Format/bbs_3mf.cpp
@@ -7397,7 +7397,10 @@ public:
         while (true)
         {
             while (m_tasks.empty()) {
-                m_cond.timed_wait(lock, m_next_backup);
+                if (m_interval > 0)
+                    m_cond.timed_wait(lock, m_next_backup);
+                else
+                    m_cond.wait(lock);
                 if (m_interval > 0 && boost::get_system_time() > m_next_backup) {
                     m_tasks.push_back({ Backup, 0, std::string(), nullptr, ++m_task_seq });
                     m_next_backup += boost::posix_time::seconds(m_interval);
diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index 0550f8ac4c..fe490c1053 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -488,10 +488,14 @@ DPIFrame(NULL, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, BORDERLESS_FRAME_
         update_slice_print_status(eEventSliceUpdate, true, true);
 
         // BBS: backup project
-        std::string backup_interval;
-        if (!wxGetApp().app_config->get("", "backup_interval", backup_interval))
-            backup_interval = "10";
-        Slic3r::set_backup_interval(boost::lexical_cast<long>(backup_interval));
+        if (wxGetApp().app_config->get("backup_switch") == "true") {
+            std::string backup_interval;
+            if (!wxGetApp().app_config->get("", "backup_interval", backup_interval))
+                backup_interval = "10";
+            Slic3r::set_backup_interval(boost::lexical_cast<long>(backup_interval));
+        } else {
+            Slic3r::set_backup_interval(0);
+        }
         Slic3r::set_backup_callback([this](int action) {
             if (action == 0) {
                 wxPostEvent(this, wxCommandEvent(EVT_BACKUP_POST));
diff --git a/src/slic3r/GUI/Preferences.cpp b/src/slic3r/GUI/Preferences.cpp
index 65d0a30f54..2901ca9ec7 100644
--- a/src/slic3r/GUI/Preferences.cpp
+++ b/src/slic3r/GUI/Preferences.cpp
@@ -415,6 +415,9 @@ wxBoxSizer *PreferencesDialog::create_item_backup_input(wxString title, wxWindow
         m_backup_interval_time = input->GetTextCtrl()->GetValue();
         app_config->set("backup_interval", std::string(m_backup_interval_time.mb_str()));
         app_config->save();
+        long backup_interval = 0;
+        m_backup_interval_time.ToLong(&backup_interval);
+        Slic3r::set_backup_interval(backup_interval);
         e.Skip();
     });
 
@@ -422,6 +425,9 @@ wxBoxSizer *PreferencesDialog::create_item_backup_input(wxString title, wxWindow
         m_backup_interval_time = input->GetTextCtrl()->GetValue();
         app_config->set("backup_interval", std::string(m_backup_interval_time.mb_str()));
         app_config->save();
+        long backup_interval = 0;
+        m_backup_interval_time.ToLong(&backup_interval);
+        Slic3r::set_backup_interval(backup_interval);
         e.Skip();
     });
 
@@ -553,6 +559,9 @@ wxBoxSizer *PreferencesDialog::create_item_checkbox(wxString title, wxWindow *pa
          // backup
         if (param == "backup_switch") {
             bool pbool = app_config->get("backup_switch") == "true" ? true : false;
+            std::string backup_interval = "10";
+            app_config->get("backup_interval", backup_interval);
+            Slic3r::set_backup_interval(pbool ? boost::lexical_cast<long>(backup_interval) : 0);
             if (m_backup_interval_textinput != nullptr) { m_backup_interval_textinput->Enable(pbool); }
         }