It shouldn't wipe your data if you choose the "Resize" option, as it can only use free space. However, there is ALWAYS a risk when editing an OS partition, so you should consider backing up your data.
Just drag them into the recycle bin. Or go to C: > Users > Username. Right-click on any folder of this location and click Properties > Location tab. Click on...
You and your computer can make backups that preserve all of your files in case of this happening. The following articles may be useful: how to back up a mac,...
