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Hmm, more information would have been ideal. I've ordered a second DNS 320, just found out about the L version today.
At least mydlink Cloud and Surveillance Center are now installable packages for 325 and indeed I have used the mydlink Cloud part of it.
The DNS-320L/345 also have mydlink mobile apps to remotely control and read/write to/from the ShareCenter from a phone or tablet.
Yes, that also works with DNS-325, assuming mydlink Cloud add-on has been enabled on 325 NAS.
I just found out that the 320L can do "NAS to USB"-Backup (see http://www.dlink.com/us/en/home-solutions/share/sharecenter/-/media/Consumer_Products/DNS/DNS%20320L/Manual/DNS_320L_A1_Manual_v1_0_EN_US.pdf page 216). If I remember right then this was asked many times for the 320, 323 and 325. So is the 320L the first D-Link-Device that can really do it without 3rd-party-applications?
Is my statement (the DNS-320L is the first D-Link device with "NAS to USB"-Backup functionality) true?
Btw I found out that the DNS-320L uses the same CPU (Marvel 88F6-LG02 88F6702-A1) as the Synology DS-112j and has the same amount of 16bit-DDR2-RAM as it but the D-Link-Device is waaaaayyy cheaper.