Open research data policies of research funders usually take as their basis the FAIR Data Principles. These summarise prerequisites which make research data “findable”, “accessible”, “interoperable” and “reusable”.
They were drawn up in 2016 by various stakeholders from the fields of research, industry, research funding and academic publishers (DOI: http://doi.org/ 10.1038/sdata.2016.18).
As far as research data management and data management planning are concerned, the overarching goal should always be to make research data FAIR, thus ensuring they are prepared for further use by humans and machines in an optimum manner. This video supports you in achieving this goal.
A list of repositories recommended by the SNSF can be found on its webpage.