Lessons Learned from a 15TB QNAP-to-Azure Storage Migration The SID mapping problem that cost us three days. The RoboCopy flags that preserve everything. The phase-by-phase architecture drawn out. And the six things I would do differently next time. By Francis Avorgbedor | Azure Engineer · July 8, 2026 · 16 min read · Azure Files · QNAP · Migration FA Francis Avorgbedor Azure Engineer · SEVENAI · Azure Field Notes 15TB Data migrated across 8 SMB shares 6 Migration phases over 6 weeks 4hrs Total user-facing downtime at cutover $474 Monthly Azure Files cost post-migration Ipreviously published the case study version of this migration — the what and the why and the overall outcome. This post is the engineering version: step-by-step processes with architecture diagrams, the exact commands that ran in production, the specific problems I did not anticipate and how I worked through them, and the six concrete things I would do differen...
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