feat: Add backup script

backup.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+set -e
+
+if [ -z "$1" ]; then
+    echo "Usage: $0 <password>"
+    exit 1
+fi
+
+PASSWORD="$1"
+PROJECT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_NAME="$(basename "$PROJECT_DIR")"
+TIMESTAMP="$(date +%Y%m%d_%H%M%S)"
+OUTPUT="$HOME/${PROJECT_NAME}_${TIMESTAMP}.tar.gz.enc"
+
+echo "Creating encrypted archive of '$PROJECT_NAME'..."
+
+tar czf - \
+    --exclude-from="$PROJECT_DIR/.gitignore" \
+    --exclude=".git" \
+    -C "$(dirname "$PROJECT_DIR")" \
+    "$PROJECT_NAME" | \
+    openssl enc -aes-256-cbc -pbkdf2 -salt -pass "pass:$PASSWORD" -out "$OUTPUT"
+
+echo "Done: $OUTPUT"
+echo ""
+echo "To decrypt and extract:"
+echo "  openssl enc -d -aes-256-cbc -pbkdf2 -in \"$OUTPUT\" -pass pass:<password> | tar xzf -"