When an archaeological site is deemed worthy of retention, an attempt has to be made to preserve the site. This could happen by adapting construction plans to the archaeological site, or by building in an archaeologically friendly way. If a site cannot be preserved in situ, it has to be excavated to preserve it ex situ. All data concerning the site will be documented, in order to save information about the site for future research.

The excavation itself is only part of the research. At the end of the field survey, all data is analysed and worked up in a report. When the research is finished, the approved report, the preserved archaeological remains and other documents are transferred to and stored in the appropriate (municipal or provincial) archaeological archives.

By storing all research data, it will remain available for future research. The working up and storing of research data are mandatory parts of an excavation, and the expenses have to be paid for by the ground-disturbing party.