Grrr.... Here I am doing a first backup to TC. My iMac has 40Gb of disk occupied. Certainly this will take time, but as a first backup one would think that this would take as much time as copying 40Gb. Strangely no, timemachine starts then slows and grinds to a halt (as noted on preference progress bar). So after 2 days of direct ethernet connection to TC the backup is still not complete. If I appreciate apple products for their simplicity, they should also work. And here there clearly is an issue. Note: TC has 800Gb free. If anyone has had a issue like this, and resolved it, I would welcome his precious advice.