diff --git a/.bashrc b/.bashrc
index 246f517902dc5bf0f57849a765681e619f2fdd93..6191c0829952daa3eeb065143e28c00f1f2348ab 100644
--- a/.bashrc
+++ b/.bashrc
@@ -203,6 +203,13 @@ ansible_all () {
     popd
 }
 
+bak () {
+    for x in "$@"
+    do
+        cp --preserve=all --reflink=auto "$x" "${x}~"
+    done
+}
+
 black8() {
     black "$@" && flake8 "$@"
 }