[OS] File backup

#!/bin/bash
#check if there iz a backup subdirectory, and if there ain't make some
if [ ! -d ./backup ]
then
    mkdir ./backup
fi
#get all tha filez from tha current directory
FILES=`ls -l | grep ^- | awk '{print $9}'`
for file in $FILES
do
    filename=`$file >> awk -F. '{print $1}'`
    #firstly copy all the files from the current directory and paste them in the subdirectory
    cp $file ./backup/$file
    #secondly rename them or rather change their extension to .backup
    mv ./backup/$file ./backup/${filename}.backup
done
touch modified.txt
#so with the mtime command we can list all files/directories that have or have not been modified in the last x dayz
echo "`find . -type f -mtime -1`" >> modified.txt
cat modified.txt