Can there be two separate Time Machine Backups on the same external drive? I'm interested in buying an external hard drive. I'd like to know whether if it's possible (and simple if so) to have two separate Time Machine Backups from two different MacBooks at the same time?
You can use an external hard disk formatted with HFS+ as a Time Machine target for several Macs without problems. Time Machine itself will make sure that the data is not getting mixed up by using the name of each Mac as part of the path.