--- backup-eressea.org	2020-12-03 19:01:33.947594665 +0000
+++ backup-eressea	2020-12-03 19:39:46.489607175 +0000
@@ -3,12 +3,21 @@
   ERESSEA=$HOME/eressea
   echo "The ERESSEA environment variable is not set. Assuming $ERESSEA."
 fi
+
 GAME=$1
 
+# script can have 3 parameters
+# $1 = game number
+# $2 = turn
+# $3 = upload url
+# the upload url and hence the upload it only done, if all three parameter are given
+[ -n $3 ] && UPLOAD_WEBDAV_URL=$3
+
 upload() {
+  [ -z $UPLOAD_WEBDAV_URL ] && return
   SRC="$1"
   DST=$(basename "$SRC")
-  echo put "$SRC" "$DST" | cadaver "https://dav.box.com/dav/Eressea/game-$GAME/"
+  echo put "$SRC" "$DST" | cadaver "$UPLOAD_WEBDAV_URL"
 }
 
 if [ ! -d $ERESSEA/game-$GAME ]; then