Decryption of user files

I'm running 8.2.2. I'm trying to decrypt the user files on the server. First I ran this:
sudo -u www-data php occ encryption:disable

Then when i ran:
sudo -u www-data php occ encryption:decrypt-all

I got this:
Server side encryption not enabled. Nothing to do.

So how do I actually decrypt the files? I can still access them in the web interface. I have not tried reenabling the encryption module because I'm not sure if the system will try to encrypt the files again.

Hi,

only new uploaded files are encrypted:

For performance reasons, when you enable encryption on an ownCloud server only new and changed files are encrypted.

https://doc.owncloud.org/server/8.2/admin_manual/configuration_files/encryption_configuration.html

so it should be safe to enable encryption again. Before messing around with the encryption its advised to do a good backup and to update from 8.2.2 to 8.2.7 first: https://owncloud.org/changelog/#latest8.2