Best NAS for iPhone camera backup?

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Hello David,I would recommend DS220+. This is a dual bay option allowing you to mirror the data on both disks. If one drive fails you have a copy on another. There is also DS218play which a cheaper version with limited options, but it would work as a photo backup solution. Synology Moments will automatically sync your photos and videos including your Live photos. You can then click and wipe backed up media from your phone and free up some space.