How do you restore if your hard drive crashes?

I use Acronis True Image to back up my entire HD. I back up all files
to create a system disk image. Now - what if I have this image on a
separate USB backupdrive. Next thing is the hard drive on the XP
computer irrevocably fails. Then I get a new blank formatted HD
installed. What do I do at that point to get it all back on the new
computer drive? Don't I need the setup files that were on the
original failed drive, and the acronis program, to bring it all back?
This is called disaster recovery? Not restoring.

Thanks.
.

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