I initially had some difficulty with TC. Backed up fine and then a day later would get stuck on 'Preparing...'. Finally resolved the issue with a 'zero erase' of TC and did a fresh backup. It's been working fine until today...... Just updated to 10.5.3, which is supposed to have fixes with TC + TM issues. Looks like it just reintroduced them for me. I might stop it and try again later. But I'm not holding my breath. I really hate the fact that I need to erase my backup to backup the HD. Sorta defeats the purpose, no?