Add Backup Integrity

Backup-Integrity.md

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+
+We verify all backups regularly to ensure they are complete, uncorrupted, and restorable.
+
+## Weekly Tasks
+
+- ZFS scrubs for all pools
+- Hash checks (SHA-256) for tarballs and dumps
+- rsync `--checksum` verification for remote mirrors
+
+## Alerts
+
+- Email/Mastodon alert if:
+  - ZFS reports checksum errors
+  - Scheduled backup is missing
+  - Remote sync fails or lags > 24h
+
+## Tools Used
+
+- `zfs scrub`
+- `sha256sum` + custom validation script
+- rclone sync logs
+- Telegram bot and Genesis Shield notifications