The custom files are stored on local drive only, they won't be uploaded to the cloud thus cannot be restored though your account.
To backup and restore the custom files, you can always find the location of custom folder, and backup/restore whole custom folder by using zip, file copy, or Windows backup/restore.
Below is the steps to query the location of custom folder on your machine:
1. Press [Win]+R, open the Run dialog
2. Type or copy the following texts to the Open command, press [ENTER]
cmd /k reg query "HKLM\SOFTWARE\Reallusion\Character Creator\3.0" /v "Custom Data"
3. A console window will pop up and show the custom folder location on your machine, please ref to the attached image.
I hope this answered your questions. Please let me know if there is anything more I can help with.
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