diff --git a/apps/aqhome-react/aqhome_react.c b/apps/aqhome-react/aqhome_react.c
index 82b4a86..baf0695 100644
--- a/apps/aqhome-react/aqhome_react.c
+++ b/apps/aqhome-react/aqhome_react.c
@@ -25,6 +25,8 @@
 #include "aqhome-react/units/u_timeprogram.h"
 #include "aqhome-react/units/u_statfns.h"
 
+#include "aqhome/data/vars_dbwrite.h"
+
 #include <gwenhywfar/misc.h>
 #include <gwenhywfar/debug.h>
 
@@ -295,6 +297,22 @@ int AqHomeReact_DecIntValue(AQHOME_REACT *aqh, const char *path, int startValue,
 
 
 
+int AqHomeReact_WriteVarsFile(AQHOME_REACT *aqh)
+{
+  if (aqh && aqh->localVars && aqh->varsFile) {
+    int rv;
+
+    rv=AQH_Vars_WriteDbFile(aqh->localVars, aqh->varsFile);
+    if (rv<0) {
+      DBG_INFO(NULL, "here (%d)", rv);
+      return rv;
+    }
+  }
+  return 0;
+}
+
+
+
 AQHREACT_UNIT *AqHomeReact_CreateUnitByName(AQHOME_REACT *aqh, const char *unitType)
 {
   /* this does not include u_timer and u_varchanges, because those are only created once globally in init.c */
diff --git a/apps/aqhome-react/aqhome_react.h b/apps/aqhome-react/aqhome_react.h
index c15608a..66085e5 100644
--- a/apps/aqhome-react/aqhome_react.h
+++ b/apps/aqhome-react/aqhome_react.h
@@ -60,6 +60,7 @@ int AqHomeReact_GetIntValue(AQHOME_REACT *aqh, const char *path, int idx, int de
 int AqHomeReact_IncIntValue(AQHOME_REACT *aqh, const char *path, int startValue, int defaultValue);
 int AqHomeReact_DecIntValue(AQHOME_REACT *aqh, const char *path, int startValue, int defaultValue);
 
+int AqHomeReact_WriteVarsFile(AQHOME_REACT *aqh);
 
 #endif
 
diff --git a/apps/aqhome-react/main.c b/apps/aqhome-react/main.c
index b325cce..18e7558 100644
--- a/apps/aqhome-react/main.c
+++ b/apps/aqhome-react/main.c
@@ -57,7 +57,7 @@
 #define FULL_DEBUG
 
 #define AQHOME_REACT_READNET_INTERVAL 300
-
+#define AQHOME_REACT_SAVE_INTERVAL    300
 
 
 /* ------------------------------------------------------------------------------------------------
@@ -166,12 +166,14 @@ void _serve(AQHOME_REACT *aqh)
   time_t startTime;
   time_t lastTimerTime;
   time_t lastFileScanTime;
+  time_t lastSaveTime;
   GWEN_DB_NODE *dbArgs;
   AQHREACT_UNIT *timerUnit;
 
   startTime=time(NULL);
   lastTimerTime=startTime;
   lastFileScanTime=startTime;
+  lastSaveTime=startTime;
 
   AqHomeReact_SetLatestNetworkFileTime(aqh, AQHomeReact_GetNewestUnitNetFiletime());
 
@@ -216,6 +218,15 @@ void _serve(AQHOME_REACT *aqh)
       lastFileScanTime=now;
     }
 
+    if (now-lastSaveTime>AQHOME_REACT_SAVE_INTERVAL) {
+      DBG_ERROR(NULL, "Writing var file");
+      rv=AqHomeReact_WriteVarsFile(aqh);
+      if (rv<0) {
+        DBG_INFO(NULL, "Error writing runtime data");
+      }
+      lastSaveTime=time(NULL);
+    }
+
     if (timeout) {
       if ((now-startTime)>timeout) {
         DBG_ERROR(NULL, "Timeout, stopping service");
diff --git a/aqhome/data/vars_dbwrite.c b/aqhome/data/vars_dbwrite.c
index 519e0d8..79b4af0 100644
--- a/aqhome/data/vars_dbwrite.c
+++ b/aqhome/data/vars_dbwrite.c
@@ -13,14 +13,17 @@
 
 
 #include "./vars_p.h"
-#include "./vars_dbread.h"
+#include "./vars_dbwrite.h"
 #include "aqhome/data/path.h"
 
 #include <gwenhywfar/misc.h>
 #include <gwenhywfar/text.h>
+#include <gwenhywfar/syncio.h>
 #include <gwenhywfar/debug.h>
 
 #include <ctype.h>
+#include <stdio.h>
+#include <errno.h>
 
 
 
@@ -52,6 +55,48 @@ static void _appendEscapedString(const char *s, GWEN_BUFFER *dbuf);
 
 
 
+int AQH_Vars_WriteDbFile(const AQH_VARS *vt, const char *filename)
+{
+  int rv;
+  GWEN_BUFFER *fbuf;
+  GWEN_BUFFER *dbuf;
+
+  fbuf=GWEN_Buffer_new(0, 256, 0, 1);
+  GWEN_Buffer_AppendString(fbuf, filename);
+  GWEN_Buffer_AppendString(fbuf, ".tmp");
+
+  dbuf=GWEN_Buffer_new(0, 256, 0, 1);
+  rv=AQH_Vars_WriteDbFormat(vt, dbuf);
+  if (rv<0) {
+    DBG_INFO(AQH_LOGDOMAIN, "here (%d)", rv);
+    GWEN_Buffer_free(dbuf);
+    GWEN_Buffer_free(fbuf);
+    return rv;
+  }
+
+  rv=GWEN_SyncIo_Helper_WriteFile(GWEN_Buffer_GetStart(fbuf),
+                                  (const uint8_t*) GWEN_Buffer_GetStart(dbuf),
+                                  GWEN_Buffer_GetUsedBytes(dbuf));
+  if (rv<0) {
+    DBG_INFO(AQH_LOGDOMAIN, "here (%d)", rv);
+    GWEN_Buffer_free(dbuf);
+    GWEN_Buffer_free(fbuf);
+    return rv;
+  }
+  GWEN_Buffer_free(dbuf);
+
+  if (rename(GWEN_Buffer_GetStart(fbuf), filename)) {
+    DBG_INFO(AQH_LOGDOMAIN, "here (%d: %s)", errno, strerror(errno));
+    GWEN_Buffer_free(fbuf);
+    return GWEN_ERROR_IO;
+  }
+  GWEN_Buffer_free(fbuf);
+
+  return 0;
+}
+
+
+
 int AQH_Vars_WriteDbFormat(const AQH_VARS *vt, GWEN_BUFFER *dbuf)
 {
   if (vt && dbuf) {
diff --git a/aqhome/data/vars_dbwrite.h b/aqhome/data/vars_dbwrite.h
index 1ff0d35..baff360 100644
--- a/aqhome/data/vars_dbwrite.h
+++ b/aqhome/data/vars_dbwrite.h
@@ -14,6 +14,7 @@
 #include <aqhome/data/vars.h>
 
 
+AQHOME_API int AQH_Vars_WriteDbFile(const AQH_VARS *vt, const char *filename);
 AQHOME_API int AQH_Vars_WriteDbFormat(const AQH_VARS *vt, GWEN_BUFFER *dbuf);