is @#^$%& broken. To compare it to cron(8) is an insult. It unschedules tasks at the faintest whiff of trouble. (Don't dare let your tasks fail, or they go into the great unscheduled limbo.) This is especially problematic if you're trying to deal with a network share that's periodically unavailable.
If you start trying to use at, do yourself a favor and make a batch file to reschedule your jobs, since you'll find yourself rescheduling them again and again and again and ...
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