I'm lost

Have the My Book studio for mac.  My hard drive was replaced yesterday.  I guess I just don’t know how to retrieve my data because I can’t seem to find it.  Is there something else I need to download to my mac?  Anyone able to help me?

The drive was replaced yesterday… So trying to retrieve data ???

You mean backing up data from computer to the external drive or restore data from external to the Mac?

What software did you use to backup the files?