Ask Dropbox if the offered paid backup media like putting your files on DVD's than have them mail them to you. Old day's prices varied on different services from one free processing a year but you give them the money for the DVD's to $59.99 plus the cost of DVD's they would say it took to backup your files on and postage to mail them to you.

One service had a mailed encryped hard drive they'd put your files on and mail it to you then you mail it back and you paid shipping and low cost once a year service use but not sure if DropBox is able to do this.

Just thought I'd offer a suggestion even thou you said you already contacted them and they did not help out but send you a link to backup your files over the internet.

Here just in case others would like to get an Idea of 

"Cloud Storage Is Not Cloud Backup"

If you looking for true backup and restore services Google search them. Some as I said will mail a large hard drive to you either with your files on it or for you to put files on it to send back to the company to load into your files online without uploading or downloading them. Hope this make's since to people! Sorry if I cause any confusion with this post. I have been though the samething and don't like it at all! Even with DropBox! If I find more information I'll post back here at sometime. Thanks for reading. Hope all goes well and everyone gets what they want!