https://blog.margrop.net/en/tag/shr/ Recent content in SHR on Margrop Blog Hugo en-US Sat, 11 Jul 2026 12:00:00 +0800 https://blog.margrop.net/en/post/nas-raid-selection-guide/ Sat, 11 Jul 2026 12:00:00 +0800 https://blog.margrop.net/en/post/nas-raid-selection-guide/ <blockquote> <p><strong>The short answer</strong></p> <p>RAID primarily keeps a NAS available when one or more drives fail. Backup restores data after deletion, ransomware, filesystem damage, theft, fire, or a failed NAS. You normally need both.</p> <p>On Synology, SHR-1 is the practical default for many homes, while larger and more critical arrays deserve SHR-2 consideration. On fnOS, choose the filesystem, storage mode, drive count, and backup destination as one design. On Unraid, understand that the classic Array is not a conventional striped RAID: data disks keep independent filesystems while one or two parity disks provide failure recovery.</p> <p>A useful starting rule is: mirror two-drive systems; use single-drive redundancy when capacity matters and a separate backup exists; seriously consider dual-drive redundancy as drive count and individual drive capacity grow. Anything irreplaceable still needs an offline or off-site copy.</p> </blockquote>