sh.zio.backup: add prototyping

usr/local/bin/sh.zio.backup

@@ -86,7 +86,7 @@ function invoke_restic() {
                 --cache-dir "$cache_dir" \
                 --password-file "$restic_repo_passwd_file" \
                 --repo "$(cat $restic_repo_file)" \
-                $command $args | tee /dev/fd/3 2>&1)"
+                $command $args 2>&1 | tee /dev/fd/3)"
 
             echo "------"
             echo "$restic_out"