Because of the restrictions for the number of kids in care at any one time I can't offer back up or drop in care unless I have a space I haven't filled. I have done back up in summers for caregivers on vacation because I had some of my daycare kids also on vacation. They paid the basic daily/weekly rate when here.

I make it clear at interviews that it is up to the parents to find their own back up, be prepared to take a day off work, find a relative, etc.

For longer things like a vacation I do have a small circle of caregivers I trust that I would be able to call to see if they had spaces open and then be willing to share with my parents as an option.