NCI-Agency/anet#407: Do exponential back-off when autosave fails
NCI-Agency/anet#407: Do exponential back-off when autosave fails

Also report the error to the user, and after how much time we will try again.

NCI-Agency/anet,NCI-Agency/anet,NCI-Agency/anet,NCI-Agency/anet,NCI-Agency/anet