backup/cleaner.sh

#!/bin/bash

EXPIRE_DAYS=14
SCAN_DIR=/backups

if [ "$(id -u)" != "0" ]; then
    echo -e "\033[31mThis script requires superuser rights\033[0m"
    exit 0
fi

trap 'echo -e "\033[31mSomething went wrong\033[0m"; exit 1' EXIT
set -e

export DEBIAN_FRONTEND=noninteractive

echo 'Cleaning old backups...'

FILES=$(find $SCAN_DIR -type f)
for file in $FILES;
   do
         timestamp=$(date -r "$file" +%Y%m%d)
         echo "Processing $file file.."
         date1yrs=$(date -d "$timestamp" +%Y)
         date1days=$(date -d "$timestamp" +%j)
         date2yrs=$(date +%Y)
         date2days=$(date +%j)
         diffYear=$((date2yrs - date1yrs))
         diffYear2days=$((diffYear * 365))
         diffDays=$((date2days - date1days))
         DAYS=$((diffYear2days + diffDays))

         if [ "$DAYS" -ge $EXPIRE_DAYS ]
           then
                echo "Deleting $file file..."
                rm "$file"
         fi
   done

trap - EXIT
echo "All backups older than $EXPIRE_DAYS days are deleted."