Hi There Bright!
There is no real limit to file sizes. Your software (or ours) will take care of very large files.
The technical answer is that a single file chunk is limited to 5GB, but you can have an unlimited number of chunks. We've successfully tested 40GB files through the Web UI and know even larger is possible through our apps.
We will move this to the FAQ because its such a great question.
Thanks!
BlompTeam!