🌐 ImmortalWrt → Smart Automatic Backup

Overview

• Script: /root/smart_backup.sh
• Schedule: Daily at 15:00
• Logic: On-demand backup - only when config changes
• Dual storage:
  • tar.gz archives: For system restore
  • configs/ folder: For viewing change history
• Retention: Local 3, Remote 30 tar.gz files
• Stability checks: Uptime (>10min), time sync, network

Backup Files

📦 tar.gz Archive (For System Restore)

• Filename: backup_20231213_150023.tar.gz
• Content: Complete system backup (sysupgrade format)
• Usage:
  • LuCI: System → Backup/Flash Firmware → Restore backup
  • CLI: sysupgrade -r backup_20231213_150023.tar.gz
• Location: GitHub repo root

📁 configs/ Folder (For Viewing Changes)

• Content: Extracted /etc/config/ files from tar.gz
• Usage:
  • View changes on GitHub
  • Git Diff highlights modifications
  • Track configuration history
• Note: Cannot be used alone for restore

Setup

1. Install Dependencies

opkg update
opkg install git openssh-client openssh-keygen ca-bundle ca-certificates

2. Generate SSH Key

ssh-keygen -t ed25519 -f /root/.ssh/id_ed25519 -N ""
cat /root/.ssh/id_ed25519.pub   # Add to GitHub SSH keys
ssh -T git@github.com

3. Configure SSH (Port 443)

cat > /root/.ssh/config <<'EOF'
Host github.com
  HostName ssh.github.com
  Port 443
  User git
  IdentityFile ~/.ssh/id_ed25519
  StrictHostKeyChecking accept-new
EOF
chmod 600 /root/.ssh/config

4. Deploy Script

wget -O /root/smart_backup.sh https://raw.githubusercontent.com/YOUR_USER/REPO/master/scripts/smart_backup.sh
chmod +x /root/smart_backup.sh
# Edit: BACKUP_DIR and GIT_REMOTE
vi /root/smart_backup.sh

5. Schedule (15:00 Daily)

echo "0 15 * * * /root/smart_backup.sh >> /root/smart_backup.log 2>&1" >> /etc/crontabs/root
/etc/init.d/cron restart

Restore Backup

Via LuCI

1. Download backup_YYYYMMDD_HHMMSS.tar.gz from GitHub
2. Login to router: http://192.168.1.1
3. System → Backup/Flash Firmware → Restore backup
4. Upload and wait for reboot

Via SSH

cd /tmp
wget https://github.com/USER/REPO/raw/master/backup_20231213_150023.tar.gz
sysupgrade -r backup_20231213_150023.tar.gz
reboot

View Changes

On GitHub

1. Open backup repository
2. Navigate to configs/ folder
3. Click any file (e.g., network)
4. Click History to view changes

Via Git

cd /root/Immortalwrt-AutoBackup
git log --oneline configs/network
git show abc1234:configs/network
git diff abc1234 def5678 -- configs/network

Notes

• tar.gz restores system: configs/ is only for preview
• Backup before restore: Always backup current config first
• Check compatibility: Ensure backup version matches system
• Large files separate: Manage OpenClash configs separately