Sophie
I'm sure when Dave gets a minute from putting out fires, he'll comment, but if I understand the specific question you are asking, I think the answer is "no." I see no reason why the source volume would be at any more risk during a power failure when it is performing a backup job than when it is performing any of myriad other tasks.
I have found the recent Apple systems to be quite resiliant in power failure crash situations, but there is always the risk. But I don't think a backup running at the time of the failure increases (nor does it diminish) the risk.
The backup, of course, is likely a goner, or, at best, will be incomplete.
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