diff --git a/src/alias.txt b/src/alias.txt
index d7f000a..44530c0 100644
--- a/src/alias.txt
+++ b/src/alias.txt
@@ -278,6 +278,11 @@ alias na='micro ~/.alias.txt'
 alias nau='rm ~/.alias.txt && wget https://git.nvme.cc/adminroot/setup/raw/branch/main/src/alias.txt -O ~/.alias.txt'
 alias clog='sudo journalctl --vacuum-time=1d'
 alias mk='mkdir -p'
+
+bak() {
+    cp "$1" "$1.bak"
+}
+
 alias l='ls --color=auto'
 alias s='ls --color=auto'