What happens to your website if your host goes out of business

If your web host goes out of business, the website files on its servers go offline with it, and often any email it ran for you too. Your domain name, though, is usually safe, because it is held by a registrar, which is a separate company even when you bought both in one place. So the real risk is not losing your address but losing the site itself, unless you have a copy. With a copy and control of your domain, a host closing is a stressful week, not a disaster.

What usually happens when a host closes

Sudden overnight shutdowns are the rare case. More often:

The host is bought by a larger company. Your account is moved to the new owner's systems, sometimes with new prices, new control panels and new terms. Annoying, but the site keeps running.
The host announces a closure with a notice period, often a month or two, and suggests a partner company to move to.
A small host or a freelancer's reseller account just stops, because the person running it retires, falls ill or stops paying their own upstream provider. This is where sites vanish with little warning.
A designer who hosted your site on their account disappears, which has the same effect.

If you host with a large, well-known company, a sudden collapse is unlikely. If your site sits on a one-person operation, plan for it.

Your domain is (usually) a separate thing

Your domain name is registered at a registrar, which may or may not be the same company as your host. Look it up at lookup.icann.org and read the Registrar line.

If the registrar is a different company from the host, the host's closure does not touch your domain. You can point it at a new host whenever you are ready.
If the host is also your registrar or a reseller for one, the domain itself is still recorded with the registry behind the scenes. If an accredited registrar goes out of business, ICANN, the body that oversees domain names, requires registrars to keep registration data in escrow so that domains can be moved to another registrar. That process protects the registration, though it can take time and you may have to deal with an unfamiliar company afterwards.
If the domain was registered in your designer's or host's name, you are depending on them, or on whoever takes over their accounts. Sort this out now. My web designer registered my domain: how to get it back explains how.

Warning signs worth noticing

Support tickets that go unanswered for days.
The host's own website looks abandoned, or its blog and social pages have gone quiet.
Repeated outages with vague explanations.
Billing emails from a new company name you did not expect.
A designer who hosts your site but has stopped replying.

None of these mean the end is near, but each is a reason to make sure you have a copy and your logins.

If you get a closure notice

You have time. Use it in this order:

Download a full backup of your site from the control panel, including the database if it is WordPress. Do it the day you hear, before the rush. Website backups: who has a copy of your site? covers what a full copy includes.
Check what else is on the account. Email mailboxes, other websites, a second domain. Make a list.
Move email first, if the host runs it. Set up mailboxes elsewhere, copy old mail, change the MX records, test. Then move the website. Mixing both on one day makes problems hard to trace.
Choose a new home for the website. The host's suggested partner may be fine; compare renewal prices, not first-year deals.
Restore the site at the new host, check it on its temporary address, then point your domain at it by changing the DNS records.
If the domain is registered at the closing company, ask for its transfer code and move it to a registrar you choose. Do this well before the closing date, because transfers can take several days.
Cancel last, only after the site and email work at their new homes.

If the host vanished without warning

The site is down and nobody answers. Work through this:

Confirm you still control the domain. Log in at the registrar. If you can edit DNS, you can point the domain at a new site as soon as one exists.
Look for any copy you have. Your designer, a backup in your cloud storage, an old computer, an email with the site attached.
Check public archives. The Internet Archive's Wayback Machine often has snapshots of business websites from public pages. It is not a backup you can restore with a click, but it lets you recover text and see what each page said.
Gather your material: text from documents and old emails, photos from your phone, the logo from your printer or sign maker.
Rebuild or restore at a new host, then point the domain.
Tell customers in the meantime. Put your phone number on your Google Business Profile and social pages so people can still reach you while the site is down.

If email ran on the vanished host, it stops too. Set up a new mailbox provider immediately and point the domain's MX records there, so new mail starts arriving. Old mail stored only on that host is likely lost.

Making the next host less risky

Keep the domain at a registrar in your business's name, with your own login.
Keep email at a separate provider if you want it to survive any website change. Website hosting and email from the same company weighs that choice.
Keep your own copy of the site and refresh it after changes.
Keep a written list of logins: registrar, DNS, host, email.
Prefer hosts that let you download your own backups without asking.

A ten-minute check today

Look up your registrar and confirm you can log in.
Find out who hosts the site and whose name the account is in.
Download a backup or save your content somewhere you own.
Note where your email runs.
Put the list of logins in your business records.

If your site sits on a host you are no longer sure about and the site itself is dated, a closure notice can be the push to replace it. You can see your site rebuilt first from what it shows now, and move the domain only when the new one is ready.