Reuse backup function

workflow/qhtcp-workflow

@@ -270,7 +270,7 @@ random_words() {
 backup() {
   debug "Running: ${FUNCNAME[0]}" "$@"
   for f in "$@"; do
-    [[ -f $f ]] || continue
+    [[ -e $f ]] || continue
     count=1
     while [[ -f $f.bk.$count ]]; do
       count=$((count+1))
@@ -1410,16 +1410,7 @@ choose_easy_results_dir() {
 
   # Always backup existing output
   # This would happen if you ran the same experiment twice in one day, for instance
-  if [[ -d $EASY_RESULTS_DIR ]] ; then
-    backup_dir="$EASY_RESULTS_DIR"
-    count=1
-    while [[ -d $backup_dir ]]; do
-      backup_dir="$backup_dir.$((count++))"
-    done
-    echo "Backing up existing output from $EASY_RESULTS_DIR to $backup_dir"
-    debug "rsync -a $EASY_RESULTS_DIR $backup_dir"
-    rsync -a "$EASY_RESULTS_DIR" "$backup_dir" || return 1
-  fi
+  [[ -d $EASY_RESULTS_DIR ]] && backup "$EASY_RESULTS_DIR"
 
   if [[ ! -d $EASY_RESULTS_DIR ]]; then
     debug "mkdir $EASY_RESULTS_DIR"