I am a major fan of double-side tape to re-sticky tapes after they've been unstuck a few times. Sticks better than the original adhesive, but rips the nappy up pulling it off, so i only use it when I've worn the nappy with it's normal tapes first and I intend to use and throw away the nappy.
Some have refastenable tapes, as Lukie says. Wearing these ones, I have sometimes undone one side to use the toilet then taped it back on. When I tape back on, I try to match the tapes back onto the (blue) landing part of the tapes that are still stuck on the front. That way I can peal them off again without tearing the plastic of the nappy. Sometimes they don't stick back on brilliantly but I usually get maybe two refastenings out of them. Sometimes I might alternate which side I open.
Taking right off though, yeah, same should work with refastenable tapes. Just fold them back into position and they should be ready for another time. I do this to make my night-time stash last twice as long. I wear one night but don't 'use', then the next night I wear the same one, use it, throw it and start again.