You can only archive clips of video size to video tape, be that Standard Def or High Def. Images larger than that have to be archived using other means. If it is only a few I would suggest using the search feature in the archive menu and looking for all images that are not video resolution and then archive them as a file archive. This file archive can then be backed up to a CD-R or other media of you choice.
Large numbers of non video rez clips would require some tape device if you wanted them in archive format (like DLT, DTF, AIT, etc….)
Jeff