Jetpack is unable to create backups

Hello,

I get daily mails saying that the backup failed.
This is very sad for me, as it was working and I changed nothing.
Indeed I now observed the credentials given from my Hoster and everything is alright.

As it was working no whitelisting is anymore needed.
Also no plugin was installed after the jetpack installation and its new conflicts now.

Thanks for your help
Regards
Jens

The page I need help with: [log in to see the link]