Recommendations for temporary file storage

Hi All,

After our FTP server was hacked I'm looking for a secure way for clients to send us large backups. They can be 100Mb-2Gb in size but they will be downloaded and deleted fairly quickly. No permanent storage is needed, on our old server files were deleted at midnight.

Ideally we would give each of our dealers a single login/pass and they will upload using a web browser on the clients site. We are only talking about a dozen logins.

Would something like DropBox work? I've never used it, but £10/user/month seems a bit high.

Looking for something more secure than a FTP server!