f3s-storage skill: backups.md — reflect reality (no zdata daily S3 cron)

The only live S3 offsite backup is the zusb quarterly workflow, which
backs up zusb/data/* (not the f-host zdata pool). Verified no aws/s3/
backup cron in root crontab on any f-host and no pre-existing /root/.aws.
zdata redundancy is via zrepl replication, not S3. Also corrected the
aws-credentials caveat (symlink is deliberately dangling on non-zusb
hosts until zusb is replugged there) and noted the 2026-07-20 install
across all f-hosts.

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