Requirements

• VPS
• Backup disk

Connection

1. First of all, you need to check for the backup disk, whether it is connected to the server or not using command: fdisk -l 
2. We will split and format the disk using: cfdisk /dev/sdb
3. After the command is sent, we will continue according to this gif:
4. We will format the disk to EXT3 filesystem using: mkfs.ext3 /dev/sdb – on any question, we will send y
5. We will create a folder, where will the backup disk be connected: mkdir /backup
6. Afterwards, the connection will be created using this command: mount /dev/sdb /backup
7. Backup disk should be now connected and visible in the root folder: