Rsync
Rsync is the directory backup and transfer tool for Linux. Installed as default in Ubuntu. It can provide any type of backup, and options are extensive.
GRsync
GRsync is a GTK-based GUI for Rsync. Install this by following command:
sudo apt-get install grsync
Bacula
Bacula is the most widely-used GTK-based open source (GPL-licensed) network backup utility that is used in both server and desktop installations. A catalogue of backups can be maintained using MySQL, PostgreSQL, or SQLite. For more info see the Ubuntu documentation. Both text-based and GUI frontends are available. Install the MySQL version:
sudo apt-get install bacula
SBackup
SBackup is a common backup and restore utility for the GTK-desktop. Install using following command:
sudo apt-get install sbackup