DiskWarrioring a Clone
 

I've used DW for 10 years and came across this in Macworld:

It’s good to have backups; it’s better to have multiple backups; but it’s even better to be sure of the integrity of your backups. It would be terrible to fetch a backup disk in a time of need and find that it can’t be read. So I regularly run DiskWarrior on my backup disks, just to make sure they’re in good shape.

Any problems caused by doing this?

thanks.

No, I can't think of any problems you'd cause by doing this.