I was just about to ask a similar question as I am about to start using (or at least trying but have a full license already) Drivepool to gather up all my SnapRAIDed drives. I am happy with the solutions moving data into the hidden drivepool folder.
My caveat is I have some duplicate folders and files on different drives that will make up part of the pool. How will drivepool cope with this?
Just for further info - these aren't so much copies for redundancy but copies made of failing data on an extrenal drive through different methods and I have to wade through all these files at some point to verify which copies are most in tact.