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# Rule 2. Share your data online, with a permanent identifier.  Nothing really lasts forever, so "permanent" just means long-lasting. For example, your personal web site is unlikely to be a good option for long-term data storage (yet, in the very short run, putting your data on your site is better than doing nothing at all!). In general, although many papers include URLs to give access to datasets, most become inaccessible within a few years \cite{doi: 10.1093/bioinformatics/btn127}. \cite{Wren_2008}.  The best option for releasing your data with long-term guarantee is to deposit them in whatever data archive is the "go to" place for your field. The archive will assign an identifier such as a "handle" (hdl) or "digital object identifier" (doi), will assure that you have provided adequate documentation, and will manage the care and feeding of your data. If no such archive exists in your field, some generic online services will host your data and issue persistent identifiers (see Rule 8). Some pointers to repositories and services are listed in the Appendix.