It would seem that the Plesk backup utility is a worthless pile of crap. ( for googles benefit when spidering this article - psadump does not backup everything properly. If you use only psadump and then wipe your system you will lose things ).
Fortunately I took a filesystem dump of the system itself before I had it wiped. Unfortunately it will take me some time to get all the necessary files back on to Hamipiks (and anywhere else that might be missing files). It's a raw deal when the backup utility you use demonstrates a major failure right when you need it.
I've posted the biggest snotgram you've ever seen onto the Plesk Forums to alert them of their flaw. I don't imagine they'll care too much, it's not their data.
To answer cpthereturns question, the information is already posted, but it's now in bold for you... You need do nothing except wait, I have the data, it is just not in the right place at the moment :)