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🗂️ Automatic Daily Home Directory Backup (Bash + rsync + cron)

📌 Overview

This project provides a production‑ready Bash script that performs an automatic daily backup of a Linux directory (default: /home) using rsync.

The script is designed with system administration and security best practices, including:

• Incremental backups using rsync
• Timestamped backup directories
• Centralized logging
• Safe default behavior
• Full compatibility with cron

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✨ Features

• ✅ Automatic daily backups
• ✅ Uses rsync (fast and efficient)
• ✅ Timestamped backup folders
• ✅ Detailed logging (backup.log)
• ✅ Prints every successful operation
• ✅ Sensible defaults when no input is provided
• ✅ Cron‑friendly (non‑interactive)

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📁 Backup Structure

If no input is provided, backups are created like this:

/home/
 ├── user1
 ├── user2
 └── backups/
     ├── 2025-12-19_07-00-00/
     ├── 2025-12-20_07-00-00/
     └── backup.log

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🛠 Requirements

• Linux system
• Bash shell
• rsync installed
• Cron service enabled

Check rsync:

rsync --version

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📥 Installation

1️⃣ Clone the repository:

git clone https://github.com/yourusername/daily-backup-script.git
cd daily-backup-script

2️⃣ Make the script executable:

chmod +x daily_backup.sh

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▶️ Usage

🔹 Run with default settings

./daily_backup.sh

Behavior:

• Source directory: /home
• Backup directory: /home/backups/
• Log file: $HOME/backup.log

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🧾 Notes

• You should use sudo with commend , so you will write like it

sudo ./project_backup.sh

• or

sudo ./project_backup.sh < dir >

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### 🔹 Run with custom source and destination

```bash
./daily_backup.sh /home/username /mnt/backup

• First argument → source directory
• Second argument → backup destination

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⏰ Automating with Cron (Daily at 7:00 AM)

1️⃣ Open crontab:

crontab -e

2️⃣ Add the following line:

0 7 * * * /full/path/to/daily_backup.sh

📌 Important Notes:

• Always use the full path to the script
• Ensure the script has execute permission
• Cron uses a limited environment (no aliases)

3️⃣ Verify:

crontab -l

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🧾 Logs

All operations are logged to:

$HOME/backup.log

Each log entry includes:

• Timestamp
• Operation details
• Success or failure status

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🔐 Why rsync?

rsync is preferred over cp because it:

• Copies only changed files
• Preserves permissions and timestamps
• Supports mirroring with --delete
• Is ideal for backups and recovery

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🚀 Possible Enhancements

• Backup compression (tar.gz)
• Backup encryption (gpg)
• Email alerts on failure
• Excluding directories (--exclude)
• Remote backups over SSH

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📄 License

This project is released for educational and personal use. You are free to modify and extend it.

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👤 Author

Shady Ahmed Computer Science Student | Cybersecurity Enthusiast Focus: Linux, Automation, Backup Systems, Security Engineering

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