Step 1: Redirect the Rewind app to use the original storage location
Quit Rewind
Open Terminal and copy & paste the following to delete the config
defaults delete com.memoryvault.MemoryVault appDataPath
Step 2: Copy the data from your external drive back to the original location
Open Terminal and copy & paste the following:
cd "${HOME}/Library/Application Support"
Copy & paste the following to delete the data at the destination, if it exists:
rm -rf com.memoryvault.MemoryVault
Copy & paste the following to copy the data (assuming you renamed your external drive "Rewind-Data"):
cp -r /Volumes/Rewind-Data com.memoryvault.MemoryVault
Note: The messages that say "Operation not permitted" will be expected, and are safe to ignore. This typically takes 100 MB / sec so can take several minutes depending on the amount of recording data.
Relaunch Rewind