Be sure to backup all your current files and the database before running a Joomla Upgrade. In fact, it is a good idea to backup your Joomla Installation and files on a regular basis. If you are going to even edit the index.php file in your template, take the time to make a quick copy of the original first. Even the best coder can break the site with a simple mistake.

Upgrading your site can overwrite some of your files. If you edited the index.php file in your template, it can be overwritten when you upgrade. It is best to make notes where you edited the index.php file - as you will need to replicate those edits with the new index.php. With minor upgrades, you can often replace the new index.php with the old one, but this is not always the case.

To backup your site, you can use 3rd party extensions like Akeeba that do the backup for you.

You can also do it manually, depending on your web hosting service.

Keep the backup around for a while for reference.

Occasionally, problems are not noticed for a few days or even weeks. At this point, you hosting company may not have a relevant backup of your site before the upgrade.

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