I back up my data via Time Machine to an AirPort drive and also regularly to an external HDD that is stored in a safe (fire protection).
Since one of the external HDDs is failing, I am unsure about data security and am considering purchasing a NAS.
Above it says that data can be copied from a USB drive (stick or HDD) to the NAS via the USB interface. Is this also possible the other way round?

Question

I back up my data via Time Machine to an AirPort drive and also regularly to an external HDD that is stored in a safe (fire protection).
Since one of the external HDDs is failing, I am unsure about data security and am considering purchasing a NAS. 
Above it says that data can be copied from a USB drive (stick or HDD) to the NAS via the USB interface. Is this also possible the other way round?

Answer

Yes, it works in both directions.

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Question about Synology DS224+