Also GFS doesn’t show ReFS savings until the point is synthesized as up to this point it will only shows as an incremental and changed blocked cannot be reused by ReFS pointers. Some limitation worth mentioning are Windows deduplication is for 4TB files so larger files will not be completely deduped.To learn more about checking the files savings please take a look at these links Also ReFS savings don’t show when viewed through file explorer. The actual space savings depend on the change rate of the source data and the types of chains that are used on the ReFS repository.It is not generally considered a good idea to have deduplication for the primary backup chain as this effects performance and increases RTPOs. Instead it would be better to use a primary repository configured with ReFS and then have a secondary location configured with Windows Deduplication (Compression should be off instead of auto).
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