1.)Shutdown abort operation is used only on emergency conditions where in you want to down your database suddenly like power outage things like that .

In this case all the datafiles will not be in conistent state since no checkpoint will happen.

when starting up instance recovery will occur so it can take lot more time to startup.If for any reason you have lost the logfiles or if it becomes corrupt then there is again a problem.


In your case your are doing a backup everynight.

The best and the only option before you is shutdown immediate.Which you should implement right away.