added backup script

scripts/restic-backup.env.example

@@ -0,0 +1,12 @@
+# Copy to restic-backup.env and set values.
+# restic-backup.env is not committed (add to .gitignore if needed).
+
+# Repository: local path, sftp, rclone, or S3-compatible.
+# Examples:
+#   RESTIC_REPOSITORY=/backup/restic
+#   RESTIC_REPOSITORY=sftp:user@backup-host:/restic
+#   RESTIC_REPOSITORY=s3:s3.amazonaws.com/bucket-name
+export RESTIC_REPOSITORY=""
+
+# Repository password (used for encryption).
+export RESTIC_PASSWORD=""