there is a folder on the uvdesk that every day downloads files and fills up my HD. when I delete nothing happens with the uvdesk, but the next day it downloads the folders again. could you tell me what it would be?
These are files within the /var/cache directory are application cache files which are auto-generated during the lifetime of your application. Since these are cache files, deleting won't cause any issues with your application. In order to resolve this, we would suggest you to setup a cronjob to routinely clear these cache files at regular intervals if you're concerned about it consuming too much of your disk space.
Alternatively, it seems that you are currently in the development environment, in which a lot of cached files are generated. What you could do instead is switch to the production environment, the amount of related cache files & logs generated wouldn't be nearly as much.