I am looking for an application to make automatic backups to an external USB drive - for use with my MacBook and PowerMac G5 - both running 10.4. I have no plans to upgrade to 10.5 so Time Machine is not an option. Also, my internet connection is not the fastest, so online backup is also out of the question. I do not need to create bootable copies, but would like to be able to specify folders to be backed up. The app must be able to keep track of changes to documents and synchronize these to tha backup disk. I will gladly pay $50 for an application if it is dependable and matches my requirements. I have demoed LifeAgent from Memeo - I really liked the features, but it was extremely slow. I set it up to do an initial update of my 15 GB Home directory on my MacBook - a task which would take it approximately 12 hours. I have heard good things about Deja Vu, SuperDuper and Carbon Copy Cloner - so I will probably demo these. Are there any other essential Backup applications that I am overlooking? Which app would you recommend?