I would like to echo Luiz's comments.
Setting up a cron job to copy, zip and scp your <confluence_home> to another is a great idea. For a full production backup you will need to do the same thing with the confluence database.
The XML backup utility built into Confluence can be a resource hog as the size of your instance grows. It is a good idea to have the process that backs up your product be external to the product. This give you an extral layer of protection through abstraction
You can change the time of daily Confluence backup, please follow this link -
Aslo I hope you find this link useful too https://www.adaptavist.com/display/Plugins/Backup+Manager
In addition to the previous comments, if you have a large instance would be also recommended to take a look at our production backup strategy to better understand how to approach a backup strategy in this kind of environment:
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