rsnapshot + autoshutdown/WOL - flexible daily backups

Hi, I feared that.
What I did not mention, because I did not think of it earlier is that I had OMV installed originally on an USB flash drive. Some time ago a friend of mine put the data to an SSD-Drive. Unfortunately I don´t exactly know how he did it, but I can ask him if you need that info. Can you imagine that there is a problem with this method.
I´m not an expert (as you probably already noticed) but I don´t think so. If it was that way, I think that OMV should not work at all.