Inside your Dropbox folder is a hidden cache folder that stores deleted files locally on your computer for faster restores. If you use Dropbox a lot, this cache folder can eat up valuable HD space.
There are a variety of maintenance routines that people can run in OS X, including the disk verification and permissions repair that come with the system, along with scripts such as cache cleaners ...
I will show you how to solve waning below in After Effects. Waning: Your disk cache folder is on a drive that does not have ...