I backup my system (fedora 14-64 bit fully patched) regularly to a "passport" external drive - 1TB).
I have been doing this for months. However some of the dump files (from dump) were over 4GB so I split them using "split" to 2GB pieces - this way I could copy the files to another external drive which only supports 32 bit file systems. This SEEMED to work flawlessly,but all heck breaks loose when I want to dismount the external drive. For the record, I run "sync" twice after the full dump finishes and then click on "unmount this file system safely" in the desktop. The first time I did this - I got the black screen of death (had to power cycle to get back); the second time I did this (test, test) I got a blue screen of death - the fedora screen that comes up after boot and before the window manager asks for username/password (just the little fedora icon in the center). Again I had to power cycle the beast.
The second time, I saw the flushing buffers widget come up before the blue screen and it looked like ti was working for a few seconds. The first time I might have removed the device before it was done, but I never saw the flushing buffers widget (it looked OK, I took the drive out and ZOWIE).
This problem never happened before I split the dump files (strange) and now it happened twice. This is the first time that fedora has completely lost it's cookies.
PS - I could not login to the machine using ssh from another machine. Only pulling the plug physically worked. PANIC!