Mobile Time Machine and Time Machine in Lion: using Terminal to view activities
At any time
A command such as this will present a lightweight overview:
tail -f /private/var/log/system.log | grep -E 'backup|mtm'
During a backup
A command such as this will present detail:
sudo fs_usage cmd backupd
When you have finished
To interrupt a running command:
From the manual page for
tmutil in Mac OS X 10.7 (Build 11A511), the description:
tmutil provides methods of controlling and interacting with Time Machine, as well as examining and manipulating Time Machine backups. Common abilities include restoring data from backups, editing exclusions, and comparing backups.
Expect Apple to publish that manual page, and others for 10.7, at: