full backup

Bill,

Every layer that contains your file represents a complete and separate copy of that file. Until you merge layers, you already have every "previous copy" of that file.

Use the bottom layer shader in the browser to rewind your archive. With the recent layers hidden, you'll see the earlier copies of your file. To retrieve an earlier version, use the recall/restore command or just drag and drop it where you want it.

I suggest looking at the Introduction section of the help (Help > QRecall Help > Guide > Introduction) and then follow the link to Understanding Layers.

Remember that QRecall does not copy files. It captures only unique data. So it's not possible to "force a full backup"; QRecall would see that all of that data has already been captured and would do nothing.