1. Upgrade in the incremental progression of one major version at a time

Login to your Linux instance and pull the next version:

sudo docker pull lscr.io/linuxserver/nextcloud:version-29.0.0
Sample output for version 31:
version-31.0.0: Pulling from linuxserver/nextcloud
2b1d751b68e0: Pull complete 
e1cde46db0e1: Pull complete 
e5627bac0b8e: Pull complete 
485b9fca31f5: Pull complete 
d78faf20d9d2: Pull complete 
9fea649eb927: Pull complete 
f9427200a252: Pull complete 
72419d5c85e5: Pull complete 
f94a69410b48: Pull complete 
12292d2f205a: Pull complete 
6e8de3fb0f2f: Pull complete 
Digest: sha256:97d67e2c804dab48a5b5843c3f8afe98ac245c23e629a4be346dc8c8a27cdac6
Status: Downloaded newer image for lscr.io/linuxserver/nextcloud:version-31.0.0
lscr.io/linuxserver/nextcloud:version-31.0.0

Goto Docker Compose > Project > select the NextCloud project > Stop > YAML Configurations > Edit this line
---
services:
  nextcloud:
    image: lscr.io/linuxserver/nextcloud:latest
to 
---
services:
  nextcloud:
    image: lscr.io/linuxserver/nextcloud:29.0.0

Start and rebuild the project > check the contain logs to ensure that upgrades have been successful with this marker "[ls.io-init] done." > verify that NextCloud site is back to running status and database has been restored

...
Repeat the process by pulling the next version (sudo docker pull lscr.io/linuxserver/nextcloud:version-30.0.0) and edit Docker Compose (image: lscr.io/linuxserver/nextcloud:30.0.0)
...
Repeat the process by pulling the next version (sudo docker pull lscr.io/linuxserver/nextcloud:version-31.0.0) and edit Docker Compose (image: lscr.io/linuxserver/nextcloud:31.0.0)
...
Finally, wrap up by pulling the latest version (sudo docker pull lscr.io/linuxserver/nextcloud:latest) and edit Docker Compose (image: lscr.io/linuxserver/nextcloud:latest)

2. Housekeeping
run "sudo docker ps" to obtain CONTAINER ID
Run bash in Docker container: sudo docker exec -it [CONTAINER ID] bash
occ maintenance:repair --include-expensive
occ db:add-missing-indices

Fix this: "PHP Warning:  Version warning: Imagick was compiled against ImageMagick version 1809 but version 1810 is loaded. Imagick will run but may behave surprisingly in Unknown on line 0"
By:
Locate your php.ini file for the PHP version in use.
Add the line imagick.skip_version_check = true to the file.
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