I deactivated auto-backups a couple of months ago, too. At the time, I wasn't aware of how much space it was taking. I turned it off because it always interrupted me at the most inopportune times and would completely cut my train of thought, waiting for up to three minutes for it to finish. Though I don't use a whole system backup, I try to remain vigilant of the amount of work I do between saves, so as not to lose anything important.
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