When my Time Machine starts to backing up my stuff, it freezes after 1.50gb, I've try it for 15 times now, and it always freezes around that number
Install the widget so you get actual detailed logs of the TM progress and what it is stuck on.
Verify the disk as well as existing sparsebundle if you are adding to old backup.
A1 and A5.. but read or glance through the rest.
Retrieving data ...