Where is the custom config saved in the system?
On the CP:
In order to access the location of a custom config file on the Control Panel, please go here:
On the current HV:
CloudBooted Hypervisors load their root filesystem from an NFS share on the Control Panel.
Since Cloudboot HVs are always booted from a standard image, they lose any custom changes, which were made, anytime they are rebooted.