Migrating a VPS goes sideways in the same places every time — and it's never the part you expect. It's the queue worker left on the old box. The certbot renewal in root's crontab.
Source: [Dev.to](https://dev.to/tyler_russo_f3ae739f97551/the-pre-migration-server-audit-what-to-document-before-you-touch-anything-3p18)