This is the problem that arrived together with the first iHost on Earth. Is there any sense in bringing back the backup question again and again? The eWeLink team expressed its point of view numerous times. Most recently about two days ago:
We are still exploring and trying to find a good solution for backups, but for now, it’s not ready.
You need to be patient and wait or switch to HA and make backups as often as you wish.
I think you should go and pay for something else if you’re not entirely satisfied. I did.