An unknown response returned from Snapshot backup attempt. Aborting. Double check Snapshot settings.

Hello,

I just wanted to backup my Multisite Network (with 10 sites) with Snapshot and got this error:

An unknown response returned from Snapshot backup attempt. Aborting. Double check Snapshot settings.

I never had that problem before – it always worked. But today the backup took really long until this error appeared. Usually it was pretty fast.

Do you know whats the problem?

Thanks & Greetings