Arkeia Network Backup Enterprise Edition for Ubuntu LTS is a completely free version of the Arkeia Network Backup software specifically for Ubuntu servers. It is available in the Ubuntu LTS (Long-Term Support) software repository. It allows an administrator to backup and restore files via a Web UI. This edition has the option to backup up to 2 machines to a 250 GB VTL or tape drive. It allows you to backup Linux machines, Windows desktops, Mac desktops, FreeBSD servers, and more.
CryptBackup is an encrypted backup application for Linux desktop users. It allows even a layperson to backup their home directory (including the desktop) on an encrypted external device with just a few clicks. Even the setup is only to choose the external device (such as an external hard drive) and to set a password.