Hi I' use the MS deduplication and DrivePool both since the beginning. I never had any major problem with them, aside some calculation glitches with older DP releases. Now I'm in troubles. The deduplication of Windows has changed a bit since the build 16299 or so. A disk previously deduplicated with Win10 or Win server 2016, after being touched by a recent W10/Server 1803/1809/Server 2019, will be silently upgraded and the deduped files become inaccessible by older incar