How do I backup my iPhone?

This may seem a goofy question. I’ve had my iPhone for a couple of years. I’ve never backed it up. How do I do that? I can’t find anything in the information section in the Safari link that mentions backing it up.

I would like to back it up to the iCloud. I do have an Apple account.

Any help would be greatly appreciated.

This page shows how to enable iCloud backups. In short: Settings / iCloud / Storage & Backup.