So, here's a question: What happens when you use Time Machine to backup multiple drives (let's keep it simple here and say one internal, one external)? How are the two backups distinguished from one another in the sparsebundle? If one wanted to restore one drive, but not the other, how would one go about doing so? What if one wants to restore both drives? When using the Leopard install DVD to restore via Time Machine backups, there are no configuration options for restoring to/from multiple drives. The only options are selecting a particular backup from the Time Machine drive and selecting a destination (note: singular!).