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It is very important that you learn early on how to backup your installation of DotNetNuke. Just incase something goes wrong, or if you delete a file by mistake, or if you change hosting companies, having a tested fully functional backup will save you time over the life of your site.
I always backup my sites directly after installation, before any upgrades to the core framework, and before installation or updating of any module. DotNetNuke itself does not provide any methods to automate the backup procedure, you need to pick a backup procedure and test to make sure the backup is fully functional. The basic steps for manually backing up your site are as follows:
Other methods exist for backing up your site as well, a few commercial modules can be found as well as a few free options as well.