A2b: that's one of these yeah (possibly the earliest, if memory serves).
A3: Not necessarily in the rootfs (especially since it's ro by default, and wiped by updates), but that's a fairly minor detail. Depending on how you handle power management (i.e., if it's to be plugged in, you can forget about every low-level potential mishaps and just keep it running), a crontab will only work as long as the device is not alseep. Otherwise, you enter the fun realm of rtc wake alarms.
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