Migrate from single volume to seperate-data volume

[SchoolGuy]

I would love to migrate from a single-data volume to a separate-data volume setup and would love to know how to achieve this.

Current HelmChart persistence values:

persistence:
  enabled: true
  storageClass: nfs-slow

New desired values:

persistence:
  enabled: true
  storageClass: nfs-fast
  size: 20Gi
  nextcloudData:
    enabled: true
    storageClass: nfs-slow
    size: 4Ti

Since my NC is "old" my current single-directory looks much different from a new deployment of NC. As such I am inclined to believe that there may be more to process than what meets the eye. I am hit by #10 and as such, I do desire to do this move to take advantage of my NVMe-backed NFS for everything but the real data for the users.

[SchoolGuy]

My successful migration looked like the following:

1. Spin up a separate NC chart instance with the same values and a different name. I used <name>-ng.
2. Change the persistence values to the desired ones.
3. Change the application container deployment to 0 replicas.
4. Copy the data folder in the old volume to the new data volume.
5. Copy the config folder in the old volume to the new config volume.
6. Copy the old database to the new database instance or change the config in the new chart instance
7. Change the application container deployment to 1 replica again.

Pray you forgot nothing, and check the logs. I did this whole ordeal to see if it helps with container startup times, and sadly, it didn't help.