Yeah, definitely try extracting the archive as a test. If there are no error messages then odds are it's all good.
I backed up my Amiga HD by making a big lha file one time and later I found the archive to be corrupt. Actually it was just one file, but the Amiga lha utility that I used seemed to "give up" when it got to that file. I was able to extract the rest of the archive using a windoze utility.
