Time Machine doesn't backup folders with same name as user

I am assuming you have already checked in in System Preferences > Time Machine > Options to ensure those folders have not been excluded?

We can then use the tmutil utility to find out some more information about this.

From Terminal enter this command:

tmutil isexcluded ~/Xcode/Attila

This will tell you whether it has been excluded from Time Machine backup or not. If it lists

[Excluded]    /Users/Attila/Xcode/Attila

You can then remove it from the exclusions list by running

sudo tmutil removeexclusion -p ~/Xcode/Attila

For more information on tmutil, check out its documentation

I had a file called Attila.sparsebundle in my home directory. Renaming it to something that's not related to the username solved the issue.