Backup in google drive creates empty files

[dunkelz]

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• [X] I have read the contributing guide lines at https://github.com/opnsense/core/blob/master/CONTRIBUTING.md
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Describe the bug

Backup files uploaded by OPNSense have no content and are empty.

To Reproduce

Steps to reproduce the behavior:

1. Follow the guide to setup backups https://docs.opnsense.org/manual/how-tos/cloud_backup.html
2. Click Setup/Test Google Drive
3. Validate an empty file is created in Google Drive
4. Make any change, check back the next day.
5. Validate another empty file was created in Google Drive

Expected behavior

The actual config file should be available in Googl Drive

Describe alternatives you considered

Any other free automatic backup option would be also accepted. Could not find free Nextcloud registration. If there is such option, kindly advise how to register for it.

Screenshots

Environment

Software version used and hardware type if relevant, e.g.:

OPNsense 25.1.7_4-amd64 FreeBSD 14.2-RELEASE-p3 OpenSSL 3.0.16