diff --git a/fishfunctions/4chandl.fish b/fishfunctions/4chandl.fish
old mode 100755
new mode 100644
diff --git a/fishfunctions/backup.fish b/fishfunctions/backup.fish
new file mode 100644
index 0000000..d09e023
--- /dev/null
+++ b/fishfunctions/backup.fish
@@ -0,0 +1,3 @@
+function backup -d "backs up a file and appends to its name the date and time of backup"
+    cp $argv[1] $argv[1].bak.(date +"%Y%m%d%H%M%S")
+end