Export Virtual Machine in qcow2 format.

[yyyy]

I don't understand, someone linked to this guide for explaining how to export a VM, it doesn't say anywhere where the VM files are stored

 

[LnxBil]

I don't understand, someone linked to this guide for explaining how to export a VM, it doesn't say anywhere where the VM files are stored

Export it via vzdump or the GUI and "it depends" on your configuration where your VMs are stored.