All well said and done. But there will be another celeb who gets hacked and God knows what will be released.
For #10, "delete" is insufficient. Make sure you use a secure delete. Standard deletes mark the file as "deleted", but leave the data on the file system where it can potentially be recovered by an "undelete" utility.
That's fair but I was trying to come up with a list that wouldn't require too much tech knowhow. I'd worry much more about deleting all copies from the cloud than someone retrieving data of an old HDD/SSD. Fair point though.