I don't think that's currently possible. I had a similar problem with someone else's PC. The person tried to use the same backup job for 2 different external HDDs. This also results in error 0x19D008500000000 for the second HDD.
The problem is with the way how source and also destination drives are recognized by HBS.
I think it's a good idea that HBS doesn't find a source partition if something has changed with the drive like a new serial number or a resized partition etc. That way you'll know that something was changed and you can update the job, for example if windows decides to resize the recovery partition and similar stuff.
But I also wished that the destination drive would just be recognized by the drive letter. So when you decide to backup to E:\ it should just do so, no matter what new disk is now E:\ or whatever was changed on the destination drive.
In your special case, both, source and destination drive, probably cannot be found due to the way HBS recognizes the paths.
The problem is with the way how source and also destination drives are recognized by HBS.
I think it's a good idea that HBS doesn't find a source partition if something has changed with the drive like a new serial number or a resized partition etc. That way you'll know that something was changed and you can update the job, for example if windows decides to resize the recovery partition and similar stuff.
But I also wished that the destination drive would just be recognized by the drive letter. So when you decide to backup to E:\ it should just do so, no matter what new disk is now E:\ or whatever was changed on the destination drive.
In your special case, both, source and destination drive, probably cannot be found due to the way HBS recognizes the paths.