It would be great to have a program to have a synchronized copy of a folder transparently.
The user would have a daemon that when detects the conection of a USB device it will look for a backup synchronization folder. If the device has got one of these, this program would copy the new content of the hard-disk folder to the backup disk.
My idea is like having an *repository* with a copy in a pendrive. Thus, making the updates to the backup device in a seamless way.
Some improvements of this software could be: adding support for encryption, adding support for commit to the hard drive, setting folder size limits, viewing which files has been changed.
It would be very interesting for people that has got important data in their hard-drives.
With the popularity of the pendrives (it's easy to have some of 16GB), and the needed of "backuping" data, this software could be a seriosly advantage for Ubuntu.