Don't know if you've found a replacement yet, but I've been very happy with
my Synology NAS, even though it's either their entry-level line or close to
it. I know they have a lot of models with 4 bays or more. Can't answer
whether they offer the other features you mentioned. This is my second
NAS, BTW, after a really disappointing experience with WD's Live Book Duo
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