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The essentials
Every guide in this topic
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How to move a WordPress site to a new host
Copy the files and database, test on the new server before anyone else sees it, then switch DNS with the old host kept as…
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How to migrate email to a new host
Copy mailboxes over IMAP, switch the MX records, and pick up the stragglers, without losing a single message.
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Website migration checklist
Everything to check before, during and after moving a website to a new host, so nothing is forgotten and nothing breaks.
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How to change hosts without downtime
Run the old and new servers side by side, switch DNS when the new one is proven, and keep the old one answering until…