My Logos-App-Memory is splitted in:
App: 172MB
Data: 145MB
Cache: 30,42 GB
Total: 30,74 GB
That is too much.
I'm too stupid to find a way to decrease the cache-memory.
It is not possible to move memory to the SD-Card.
A matter of fact is now, that I'll save much money, I can't buy more packages for the time 
Thank's a lot for helpfull tipps
Andi