Hi,
Have you found the solution to your query yet?
As I understand, you mentioned 'file-based' backup via manual execution works, but schedule one fails ? Is there any error message that you can share with us ?
With file-based data backups, the backup schedule is typically once per day (Page:7)
https://www.netapp.com/us/media/tr-4313_tcm10-126066.pdf
Could you try deleting the 'file-based' backup that worked via manual execution first before running schedule ? Could you just run one file-based backup via schedule method for the day.
I believe logs should give us some indication, have you raised a ticket with NetApp yet ?
Thanks!