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How to backup a file before changing it with "REX Configuration management" (rexify)

The release notes for rex version 0.44 mention: Rex::Ext::Backup - a simple backup module. This module creates a backup of a file before rex changes it. include qw/Rex::Ext::Backup/; set ...
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How to create a directory with rex

I think the documentation in the rex book is a little older. Please take a look here https://www.rexify.org/docs/api/ or (as of today) the most current docs here: https://www.rexify.org/docs/api/1.4/...
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