[Snapshot Pro] Snpshot wont make backup

Hello, wpmudev team, I'm trying to make a backup in one of my sites but can't figure it out if I'm missing something, just can't make it work.
I configured the managed backups, and the plugin says the site comply with all the requirements but when I try to make the first backup, it just says: "General backup error" then I clicked try again and it appears like the backup is building, but then again the error message <empty response> appears.
I tried with duplicator and everything went fine
thanks you for your time
-Enrique