I cant’t backup my icloud even from macbook. It failed. Now i have new iphone 11 and need to move all my data from iphone 7.

Your iCloud storage might be full. Check it in Settings>[your name]>iCloud.

If you need more storage, see this article:--> Buy more iCloud storage - Apple Support

Shouldn't be this case, choose a different (doable) method to tranfer data among the ones listed in this support guide:--> Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support

Regards

Giulio

Why can't you backup to iCloud? You can try using Quick Start, see this, Use Quick Start to transfer data to a new iPhone, iPad, or iPod touch - Apple Support