What are all the files I see in the /cache /tombstones folder? Can I delete them?
Tombstones are dump files from crashed processes. If you are not debugging and don't need them for troubleshooting (IE you are not in contact with the developer of the crashed app) you can delete them if you have root access. Of course they will probably be recreated as the app crashes again, but if they belong to an app you have uninstalled ( or the app has been patched and no longer crashes) you will regain the space "permanently".
The dropbox files look like crash dumps and troubleshooting stuff, you might want to google it to be sure. As far as the usage stats I suppose if you wanted to you could delete them it *should* just zero out your stats. I would try moving them first to see if it causes anything crazy to happen.
It’s been almost nine months since the LG G Pad … more
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?