#!/bin/bash
# remove old backups

# variables
BACKUPDIR="/DATA/Backup"
RETAIN=3

# start
set -e

cd "$BACKUPDIR"
ls -t *.tar.gz | tail -n +$((RETAIN+1)) | sed "s/Z-islcp-.*/Z-islcp-*/" | xargs -i'{}' sh -c 'rm -f {}'