Managed backups are not working and I can't download snapshot files

I can’t create full site backup from the Hub, I’m getting an error:

“Backup erro: Yesterday at 4:23pm
Please check your backup configuration.”

I tried to run a Managed Backup from the site, but it runs too slow and it ends up failing and returning a “0” error.

So, I tried running a complete snapshot and I got the message saying that it was successfully created, but if I try to download the file I get an error ERR_INVALID_RESPONSE.