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Yes, you can delete some data which will also help you free some space in your account, however, I am not quite sure what you mean by "email uploads".
What I can tell you is that you should delete the submissions where file attachments are as well, since files are the ones using up your storage space.
Please do be sure to create a backup of your data - download the needed data, since you will be removing the files and the submitted data with them.
If you have any questions along the way, do let us know and we would be happy to assist with it/them.