feat(backup): add Restic S3 backup recipes

Introduce comprehensive recipes for Restic-based S3 backups.
Covers installation, S3 repository configuration, automated backup job creation, and restoration of files.

recipes/backup/04_restore.md

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+# Restore Backup
+
+This recipe restores files from a Restic repository.
+
+## Load Environment
+
+```bash
+source <(sudo cat /etc/restic.env)
+```
+
+## List Snapshots
+
+```bash
+restic snapshots
+```
+
+Expected output:
+
+```text
+ID        Time                 Host
+----------------------------------------
+xxxxxxxx  YYYY-MM-DD HH:MM
+```
+
+## Restore Latest Snapshot
+
+```bash
+restic restore latest --target /tmp/restore
+```
+
+## Restore Specific Snapshot
+
+Replace `<snapshot-id>` with the desired snapshot.
+
+```bash
+restic restore <snapshot-id> --target /tmp/restore
+```
+
+## Restore a Single Directory
+
+```bash
+restic restore latest --target /tmp/restore --include <PATH>
+```
+
+Replace:
+
+- `<PATH>` with the folder path you want to restore (e.g. `/srv/samba`)
+
+## Verify Restored Files
+
+```bash
+ls -la /tmp/restore
+```
+
+## Verify Repository Integrity
+
+```bash
+restic check
+```
+
+Expected output:
+
+```text
+no errors were found
+```
+
+## Troubleshooting
+
+### Repository not found
+
+Verify:
+
+```bash
+echo $RESTIC_REPOSITORY
+```
+
+### Authentication failed
+
+Verify the configured S3 credentials.
+
+```bash
+echo $AWS_ACCESS_KEY_ID
+```
+
+```bash
+echo $AWS_SECRET_ACCESS_KEY
+```
+
+### Wrong password
+
+Verify:
+
+```bash
+echo $RESTIC_PASSWORD
+```