How to increase available space after Nextcloud install

Nextcloud version (eg, 20.0.5): Nextcloud HanssonIT VM (23.0.0)
Operating system and version (eg, Ubuntu 20.04): Ubuntu Server 20.04
Apache or nginx version (eg, Apache 2.4.25): 2.4.41
PHP version (eg, 7.4): 7.4.3

The issue you are facing:

I installed Nextcloud using the script on to a rather small NVMe SSD of just 16GB. I now wish to expand this space with a 4TB USB hard drive so that I can sync files and folders without the risk of very quickly running out of space.

What is the process for doing this? Is the process easily repeatable should I wish to further expand storage again in the future?

This is what lsblk -f looks like on my system:

NAME                      FSTYPE      LABEL                 UUID                                   FSAVAIL FSUSE% MOUNTPOINT
loop0                     squashfs                                                                       0   100% /snap/core18/2128
loop1                     squashfs                                                                       0   100% /snap/lxd/21029
loop2                     squashfs                                                                       0   100% /snap/core20/1270
loop3                     squashfs                                                                       0   100% /snap/snapd/12704
loop4                     squashfs                                                                       0   100% /snap/core18/2253
loop5                     squashfs                                                                       0   100% /snap/snapd/14295
loop6                     squashfs                                                                       0   100% /snap/lxd/21835
├─sda1                    vfat                              D9A9-770D                               505.8M     1% /boot/efi
├─sda2                    ext4                              448a741c-8195-4243-b836-974093fc092b    801.7M    11% /boot
└─sda3                    LVM2_member                       UXfhAJ-HTMC-9qBo-X10b-5sYo-wrEl-BQSaJw                
  └─ubuntu--vg-ubuntu--lv ext4                              ed2f1555-a6a7-40c4-9bde-b43af88369a6      5.6G    52% /
sdb                       iso9660     Debian 11.1.0 amd64 n 2021-10-09-10-10-23-00                                
├─sdb1                    iso9660     Debian 11.1.0 amd64 n 2021-10-09-10-10-23-00                                
└─sdb2                    vfat                              A4E9-5881                                             
└─sdc1                    ext4                              75dd4ff9-93f6-417e-b51a-bf0286011b82         

I suppose what I am aiming for is for /sdc1 to be used for Nextcloud data. I don’t know how to achieve this, whether I need to merge the filesystems or if Nextcloud can automatically roll over to the other disk, or if I simply need to reconfigure a config item somewhere to point to that disk.

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!): I don’t know what my path to nextcloud is unfortunately.

There may be other options, but to me it seems easiest to relocate the data directory to the USB drive:

Hi, as I can see LVM in your system please consider to use it. See the linked article or youtube videos to that matter. It will take a while to understand and implement but you will love (or hate) it in long term.