Harbor is a full registry product: scanning, replication, projects, and several backing services. On aarch64 it is also heavy, and it was a poor fit for four RK1 boards (ARM support is still catching up). After moving Talos from x86-64 to ARM64, Harbor stayed disabled in Git; Zot serves oci.this-is-fine.io instead.

Harbor shines when you want built-in scanning UI, replication policies, and a large operations surface. The lab mainly needed push, pull, sign, and admit — a smaller registry that speaks OCI and runs comfortably on ARM boards was the better fit.