Linux Hint published a tutorial about how to backup an Arch Linux system.
How to Backup an Arch Linux System
It's always a good idea to back up your data by any means necessary. rsync is a free and open-source Linux utility that synchronizes files in a remote computer with an external HDD. The method I prescribed with rsync is a surefire way to guarantee your data's well-being from any hardware malfunction. In this article, how to backup an Arch Linux System is explained.
How to Backup an Arch Linux System – Linux Hint