Update CNAME record without downtime

We want to use a backup server, when the website goes down.

Public website: example.com
Running server: example.aws.com
Backup server: example2.aws.com

How can we use the backup server without downtime?

If we update the CNAME record, it takes some time before it is working.

Can we use Cloudflare load balancer?

You can’t use Cloudflare DNS for failover, but you can do it with the Load Balancer:

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