bundles/backup-client: only log to logfile when not running in debug mode

bundles/backup-client/files/generate-backup

@@ -62,10 +62,13 @@ trap "on_exit" EXIT
 
 # redirect stdout and stderr to logfile
 prepare_and_cleanup_logdir
+if [[ -z "$DEBUG" ]]
+then
     logfile="$logdir/backup--$(date '+%F--%H-%M-%S')--$$.log.gz"
     echo "All log output will go to $logfile" | logger -it backup-client
     exec > >(gzip >"$logfile")
     exec 2>&1
+fi
 
 # this is where the real work starts
 ts_begin=$(date +%s)