These include Rsync, Bacula and [https://labs.riseup.net/code/projects/backupninja Backup NinjaBackupNinja], for this guide we are going to recommend Backup Ninja in comparison with Duplicity, as it this allows for incremental backups which are encrypted using GPG. This means that if the server that the data is being backed up to is compromised, the backed up information is still encrypted. However, this means that the GPG key used to encrypt the data should be stored both on the server being backed up and also offsite in order for its use in case of the need for the retrieval of backups. Additionally, it Duplicity allows for differential backups - meaning that only changed data is updated reducing the time and foot print of each backup.