Examples of file formats:
The formats you choose will make future access to your research easier or more difficult. Use non-proprietary, more common formats when you can, and save final versions of files in multiple formats. Ask advisors and colleagues what file formats they typically use, as many disciplines have default formats for their data.
More information on file format best practices can be found here, on the Stanford University Libraries website. The Library of Congress has pages for the Sustainability of Digital Formats and a Recommended Formats Statement, as well. If you are working with website materials, try Archive-It and Robust Links.
*Some information adapted from Educopia Institute ETD+ Toolkit