The Zip and Unzipsfx Location entry fields are for the locations of InfoZip's zip.exe and unzipsfx.exe. DeskTop Backup tries to locate them on startup so they may already be entered for you but if they are not, you'll need to "browse" for them.
Be sure you are using version 2.2 of the InfoZip "Zip" utilities. If the version that is found or the one you browse for is not version 2.2, the entry field will remain blank and you will not be able to use the setup tool to build archives. The reason it needs to be 2.2 has to do with the way the archives central-directories are adjusted when they are built.
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