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it stay long enough that anybody who need to restart can

Any idea how long it's supposed to remain on there?

It seems to be up for at least a week, I haven't tried pulling anything too old because it's out of focus. If you're building a service with this you might want to store at least a daily snapshot of the state, most of the memory management happens once daily, and even if it was a gig, it'd take ~3 years to fill a consumer level 1TB harddrive.

Could always implement an incentive mechanism to keep selected backups. :)