This may not be the answer to your question, but (as a workaround) you could make a copy of the survey and do you data entry on the copy (while the original online-version is already expired). After you're done you could then export and merge the two datasets in you data analyses package (Excel, statitical software) or import the "online dataset" in the "offline survey" in Limesurvey using the VV-export/import feature.
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