Hello there!
The /etc/fstab file is a very important system configuration file in Linux. It stands for "file system table" and it defines how file systems are mounted when the system starts up.
Think of it like a set of instructions for your operating system. When your computer boots, it reads this file to know which partitions (like /dev/vdb3 in this step) should be mounted, where they should be mounted (like /backup), what type of file system they are (like xfs), and what options to use when mounting them.
By adding an entry for /dev/vdb3 to /etc/fstab, we're telling your Linux system to automatically mount this partition to the /backup directory every time the system starts. This ensures that your /backup location is always available without manual intervention.
Let me know if you have any more questions about /etc/fstab or anything else in this step!
