Update .gitignore, add backup script

scripts/backup.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+BACKUP_DIR="/home/aaron/nextcloud/data/data/aaron/files/Admin/Backups"
+DATE=$(date +%Y-%m-%d)
+mkdir -p "$BACKUP_DIR"
+
+# Copy critical files
+cp ~/aaronai/memory.md "$BACKUP_DIR/memory-$DATE.md"
+cp ~/aaronai/settings.json "$BACKUP_DIR/settings-$DATE.json"
+cp ~/aaronai/conversations.db "$BACKUP_DIR/conversations-$DATE.db"
+
+# Keep only last 7 days
+find "$BACKUP_DIR" -name "*.md" -mtime +7 -delete
+find "$BACKUP_DIR" -name "*.json" -mtime +7 -delete
+find "$BACKUP_DIR" -name "*.db" -mtime +7 -delete
+
+echo "Backup complete: $DATE"