Treat URL changes as a migration: challenge unnecessary renames, map old URLs to real replacements, use permanent redirects, update internal references, and verify the move after launch.
Separate portable Squarespace content from platform-specific layouts and features, then rebuild only the functions the business still needs while preserving important URLs and control.
Migrate to static architecture only when the site's real needs no longer justify a runtime CMS, while preserving useful content, URLs, forms, media, and ownership.
Treat web hosting and mail routing as separate systems, preserve existing mail-related DNS records, and change only the records required for the website move.