The Synology DiskStation DS225+ is a compact 2-bay NAS designed to centralize, share, and protect your files at home or in a small office. In this setup with 2 x 4 TB hard drives configured in RAID 1, your data is duplicated on both drives to improve fault tolerance (if one drive fails, the other keeps a copy).
Key Features of the DS225+
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2 SATA bays (3.5" / 2.5" drives)
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Processor Intel Celeron J4125 (4 cores, 2.0–2.7 GHz)
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Memory 2 GB DDR4 (expandable up to 6 GB)
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Network: 1× 2.5 GbE + 1× 1 GbE (faster transfers on compatible networks)
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Performance: up to ~282 MB/s read and ~217 MB/s write (sequential)
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Synology DSM OS: backup apps, private cloud, sharing/synchronization, and video surveillance (up to 25 IP cameras supported as announced by Synology)
Capacity with 2×4 TB in RAID 1
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Raw capacity: 8 TB
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Usable capacity: ≈ 4 TB (the second drive acts as a mirror)
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Purpose: security / continuity, not space gain
What is it used for exactly?
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Automatic backups for PC/Mac, servers, mobile devices
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File sharing (user permissions, links, remote access)
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Private cloud (Synology Drive)
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Media server (photo/video library)
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Video surveillance (Surveillance Station)
