The Synology DS223 is a good entry level NAS that offers a good solution for a home backup system and a good introduction into the Synology DSM.
Synology DS223 NAS Review – NAS Compares
Synology DS223 Review » YugaTech
Synology DiskStation DS223 review: Compact and efficient!
Synology DS223 NAS Review – NAS Compares
Synology DS223 2-Bay 8TB NAS w/ 2x4TB N300 Hard Drive Bundle
Synology DS223/24TB-HAT3300 Reviews - Synology DS223 2-Bay NAS HDD Bundle
Synology DS223 Review: An Excellent Server
Synology's New 2-Bay DS223 NAS Promises Simple Data Management
Synology launches the DS223, a new 2-bay NAS as a replacement for the DS218
Synology DS223 NAS Review – NAS Compares
Synology DS223 NAS Review – NAS Compares