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You can have images go to your dropbox, sure. Its in the "integrations". There are several turorials, google them.
Once your files are save to dropbox, go to your "submissions" tab -- which controls them -- and delete all of the submissions data.
IF this is a regular thing for you, getting a Bronze package now while its on sale would save you hours of back and forth.
As our friendly user LHMnashville pointed out, we do support integrating your forms with Dropbox. You can take a look at the following guide for more details:
Upon integrating a form, a copy of submitted/uploaded files from subsequent submissions would automatically be sent to your Dropbox.
Please let us know if you need further clarifications or assistance, and we will be happy to help.