diff --git a/build-deb/flaskapp/DEBIAN/postinst b/build-deb/flaskapp/DEBIAN/postinst
index dc2e190..cd8030f 100755
--- a/build-deb/flaskapp/DEBIAN/postinst
+++ b/build-deb/flaskapp/DEBIAN/postinst
@@ -2,3 +2,11 @@
 /usr/bin/systemctl enable flaskapp.service
 /var/flaskapp/init_db.py
 /sbin/service flaskapp start
+if [ -f /tmp/oldflaskappconfig.ini ] ; then
+	cp /tmp/oldflaskappconfig.ini /var/flaskapp/flaskapp/config.ini
+	rm /tmp/oldflaskappconfig.ini
+fi
+if [ -f /tmp/oldflaskapp.db ] ; then
+	cp /tmp/oldflaskapp.db /var/flaskapp/instance/flaskapp.db
+	rm /tmp/oldflaskapp.db
+fi
diff --git a/build-deb/flaskapp/DEBIAN/preinst b/build-deb/flaskapp/DEBIAN/preinst
new file mode 100755
index 0000000..d54491e
--- /dev/null
+++ b/build-deb/flaskapp/DEBIAN/preinst
@@ -0,0 +1,6 @@
+if [ -f /var/flaskapp/flaskapp/config.ini ] ; then
+	cp /var/flaskapp/flaskapp/config.ini /tmp/oldflaskappconfig.ini
+fi
+if [ -f /var/flaskapp/instance/flaskapp.db ] ; then
+	cp /var/flaskapp/instance/flaskapp.db /tmp/oldflaskapp.db
+fi
diff --git a/build-deb/flaskapp/DEBIAN/prerm b/build-deb/flaskapp/DEBIAN/prerm
index 8d8b4fe..2cf295f 100755
--- a/build-deb/flaskapp/DEBIAN/prerm
+++ b/build-deb/flaskapp/DEBIAN/prerm
@@ -1,3 +1,9 @@
 #!/bin/sh
 /sbin/service flaskapp stop
 /usr/bin/systemctl disable flaskapp.service
+if [ -f /var/flaskapp/flaskapp/config.ini ] ; then
+	cp /var/flaskapp/flaskapp/config.ini /tmp/oldflaskappconfig.ini
+fi
+if [ -f /var/flaskapp/instance/flaskapp.db ] ; then
+	cp /var/flaskapp/instance/flaskapp.db /tmp/oldflaskapp.db
+fi