Could you please add an option to BINARY compare the files for integrity? This possiblilty was also often discussed in other threads since a couple of months. Currently there is no means of really verifying integrity.
If I have 3x duplication and one file is differs from the other, then it is easy to have the third copy replaced by the others ones. Also with 2x duplication a conflict should be detectable.
I also had the problem, that I copied some 100 GB of data from one disk to another and a binary comparison afterwards showed differences. This problem cannot be detected by DrivePool currently and should be fixed, at least with the command line option and even better in the management interface, to have a scheduled full or partial verification.