I found these posts by using the search function at the top right of the forums

This is a sticky post in the Virtual Families Guide forum that details how to backup a save game file.

This thread details how to get multiple families on a computer, but you should be aware that it is detailed and suggested by other players like yourself.

Finally, if your store does not restock within 4 hours, tap the R key while you are on the store screen and your store will restock.