The OA community - particularly PeerJ - has solved this problem by forcing you to upload supplementary data either to their website (if it's small enough) or to

The OA community - particularly PeerJ - has solved this problem by forcing you to upload supplementary data either to their website (if it's small enough) or to Figshare, which does not allow you to delete data once it is uploaded and paired to a research study. It works rather well.