transfer.sh: fix touch of last_backup

transfer.sh

@@ -37,6 +37,7 @@
 # 2022-10-21  ah     v2.7  shell fixes; 
 # 2022-11-04  ah     v2.8  rename hooks
 # 2022-11-07  ah     v2.9  run brefore-transfer hook after registration
+# 2023-02-22  ah     v2.10 fix touch of last_backup
 # ================================================================================
 
 
@@ -416,8 +417,6 @@ function setAction(){
             t_backupDirDoPostTasks
             echo
 
-            touch ${lastbackupfile}
-
         else
           color warning
           echo "DIR SKIP $mydir ... does not exist (no error)"
@@ -425,6 +424,7 @@ function setAction(){
         fi 
         echo
       done
+      test $rc -eq 0 && touch "${lastbackupfile}
     else
       echo "SKIP backup of dirs"
     fi