When I try to backup a fairly large folder (6GB or so, Titanium Backup Folder) to a drive shared via FTP, the process will appear to go fine for a while and then eventually my phone will stop responding to new input and just display a black screen. The only way to bring my phone back is to hold both the powerbutton and up volume button to force reset the phone.
I tried finding log files on my phone, but I do not know where they are stored.