Your data is valuable! Preserve your data in a responsible manner latest at the end of the project.
ÅAU promotes the openness, transparency and shared use of research data following the FAIR principles, according to which data should be findable, accessible, interoperable and reusable. However, it is up to the researcher to determine level of access to his/her data on a case by case bases. Also, the researcher can choose to open only a part of the data. Data or parts of the data can be completely open, or may be restricted, for example for research purposes.
At least register your data in Etsin (via FIARdata.fi), which means other researchers can find is and refer to it.
Research data as well as associated metadata should be saved and shared safely and reliably during the project and stored and recorded in ways that enable access and re-use once the project is completed. Once the project has ended, archive your data register or index the data in a searchable resource using globally unique and persistent identifiers. It is up to you to decide who has access to the data and for what purposes.
Read more about open data here (link?)
Open archives (all fields of research) - free of charge to researchers in Finland
For the humanities, social sciences and medicin, but also others:
Publishing data with a restrictive license (CC-BY-NC-ND) is to be preferred to keeping it on your own harddrive.
Opening the data under the license CC-BY (or CC0 including a requirement to quote) is explicitly giving others the right to reuse it, which may prove beneficial in the long run since those who may want to use the data won't have to track down every single participant in the creation of the data to get permission for reuse.
Recommended open repositories
Search services for open repositories
Services and tools for research
Describing data, metadata standards
Applying an open license is a way of informing others of what rights they have to share and reuse ones research data. Without a license, potential valuable reuse may be unwillfully restricted. Often Creative Commons licenses are used, complemented with CC0 (for data which is not covered by copyright law).
Graphics, diagrams etc. are covered by copyright law and are often included in publications, see the open access guide.
Guide for licensing research data: https://www.openaire.eu/how-do-i-license-my-research-data