<i>a 5 minute warning wouldn't actually be useful because if there was a save point, you've saved,</i> Not with cloud storage where disk I/O costs money. You

<i>a 5 minute warning wouldn't actually be useful because if there was a save point, you've saved,</i> Not with cloud storage where disk I/O costs money. You really only want to save at the end of a task rather than during it. Or you save the results off-cloud in a back store hosted elsewhere. (all of which assumes you are working at scale, where the cumulative costs become prohibitive)