What steps will reproduce the problem?

1. Install Flyback [I run gdebi on downloaded .deb]
2. launch it from menu (Applications/System Tools/Flyback Backup Manager)
3. Run first backup on a pretty large home dir (>300GiB)

What is the expected output? What do you see instead?

backing up:... > 46h. backing up:... 22h

What version of the product are you using? On what operating system?

0.6.5-1. Ubuntu 10.04.

Please provide any additional information below.

The annexed image shows the df (in KiB) for the destination partition roughly traced with gnuplot; the x axis reports the number of collected samples (with a constant 5 second period); y axis reports the df output. Output is on a dedicated ext4 partition USB external disk.

The error appeared also in a previous attempt to perform the backup using the original NTFS partition, which aborted due to an IO error after about two days of run, having reached a significantly smaller amount of data.

Please remove this unintended duplicate of issue 97. :(