What are ACLs?
 

This is, I'm sure, a dumb question, but I cannot find the answer in the SD manual or in any forum or FAQ. What are the "ACLs" that one can copy from the source drive (click Options, then Advanced tab)?

Not dumb at all. ACLs are "Access Control Lists", a new feature that was introduced in Tiger, but only used in Tiger Server. In Leopard, though, they're on by default for both client and server, and need to be properly handled.

In general, this option should be left checked (the default) unless you have good reason to uncheck it -- and you probably don't (which is why it's in Advanced). :)

What are ACLs?
 

Thanks, Dave.