Others should be able to understand what you did. It is not enough to just provide data. Without associated information, research data quickly become useless. For all data selected for preservation, you should therefore keep a ‘data package’ consisting of:
This is especially practical if the data package can be found and used on its own account. This is the case if it is published in a data repository or data journal as a data package for reuse.
Do not forget to explicitly state who is responsible for the content of the data package, who is to be contacted in case of a request for access, and under what conditions access is granted.
If preserving your raw data poses problems, alternatives can also ensure verfication. For instance, transcripts of recorded interviews could hold all important information and may be less privacy-sensitive, so it is reasonable to preserve those instead of the recordings themselves. Also, if raw data is very large, preserving your data only in some processed form could be an alternative. Combined with, for instance, a demonstrable quality check on the processing.