Sources checked 27 October 2026.
GitHub’s 21 October engineering post describes a major repository-infrastructure transition intended to accommodate growing traffic. A striking percentage in its headline can be misread, so the distinction between copying data and completing a migration is worth explaining.
What GitHub reports
The post says a copy of 99.99999% of GitHub’s repositories has reached Azure. It explains that repository replicas still exist across its own data centres and Azure, and that some of the busiest repositories require further architectural changes. This is GitHub’s account of its infrastructure, not an independent audit.
Why the remaining fraction matters
A small percentage of repositories need not represent a small share of operational difficulty. The post describes write coordination and network latency as constraints on especially busy repositories. Counts alone do not measure workload, risk or the complexity of moving a dependency.
The broader lesson for a website migration
Our editorial takeaway is to track stages separately: a verified copy, a working test, traffic cutover and retirement of the previous system. Calling the first stage ‘finished’ can conceal work still required for routing, integrations or recovery. The same reporting discipline is useful even for a much smaller publishing website.
What users should not infer
The engineering post is not an instruction for ordinary GitHub users to relocate their own repositories or change settings. Read the original for the technical architecture and follow official notices for any user-facing action. We do not claim that copying a small website will reproduce GitHub’s design, performance or availability.
Sources and related reading
GitHub Engineering: The bridge to agent-scale Git infrastructure.
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