[ubuntu] Ubuntu One / scheduled backups / local USB drive

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http://ubuntuforums.org – I simply want to carry out backups of my folders/files when they are changed and would like to use my external USB drive as backup storage. I can do this using Acronis True Image on Windows XP for folders/files (NTFS) that Windows explorer can access but I want to do it for files/folders (ext4) on Ubuntu. Is there and easy way to do this please using a GUI and not using terminal commands? (Hardware)