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Auto-Tier = Incremental File-Level Snapshot Backups.
Snapping = ZFS Snapshots are kept in the ZFS volume, so yes, your storage will be used, if you decide to use Snapshots for Restore.
Scrubbing = ZFS Scrubs allows you to schedule and manage scrubs on a ZFS volume. Performing a ZFS scrub on a regular basis helps to identify data integrity problems, detect silent data corruptions caused by transient hardware issues, and to provide early alerts to disk failures. If you have consumer-quality drives, consider a weekly scrubbing schedule. If you have datacenter-quality drives, consider a monthly scrubbing schedule.