[How-To] Format and Mount Data Drive on Debian Server

This doc shows how to take an additional virtual hard drive on a linux vm and make a mount point on the main drive with it for nextcloud data.

List of prerequisites:

Use fdisk to partition the drive:
```
sudo fdisk /dev/sdb
```
Inside the fdisk utility:
- Press n to create a new partition.
- Select p for a primary partition.
- Accept the default values for the first and last sectors (this will use the entire disk).
- Press w to write the changes and exit.

Verify the partition name (it should be /dev/sdb1 after partitioning):
```
lsblk
```
Format the partition with the ext4 filesystem:
```
sudo mkfs.ext4 /dev/sdb1
```

Create a directory to mount the drive (e.g., /mnt/nextcloud-data):
```
sudo mkdir /mnt/nextcloud-data
```

Mount the partition to the directory:

sudo mount /dev/sdb1 /mnt/nextcloud-data

Get the UUID of the new partition:

sudo blkid /dev/sdb1

Example output:

/dev/sdb1: UUID="abcd-1234-efgh-5678" TYPE="ext4"

Add the following line to the file:

UUID=abcd-1234-efgh-5678 /mnt/nextcloud-data ext4 defaults 0 2

Move existing Nextcloud data to the new drive:
```
sudo rsync -a /path/to/current/nextcloud/data/ /mnt/nextcloud-data/
```
Replace /path/to/current/nextcloud/data/ with the actual path to your current Nextcloud data directory.
Update the datadirectory path in Nextcloud's configuration file (config.php):
```
sudo nano /var/www/nextcloud/config/config.php
```
Find the datadirectory line and change it to:
```
'datadirectory' => '/mnt/nextcloud-data',
```

Set the correct permissions:

sudo chown -R www-data:www-data /mnt/nextcloud-data

Restart the web server and PHP:
```
sudo systemctl restart apache2
```
Ensure everything works:
- Log in to your Nextcloud instance.
- Verify that the new data directory is being used.