SmartPicks for dynamic file selection; backs up files as soon as they change; offers photo-sharing support.
Restoring SmartPicks is tedious and awkward; poor support for large files; doesn’t work with optical media; limited iDisk support.
The concept of instant and automatic backups is a good one. But LifeAgent 2.1 needs significant work, especially in the area of file restoration, to contend with the likes of Time Machine.