This project contains two scripts, backup.sh and restore.sh, that provide functionality for performing backups and restores of directories using tar, gzip, and GPG encryption.

The backup.sh script creates a backup of directories and files in the specified source directory. It supports encryption and can backup only the modified files within a specified number of days.

./backup.sh source_path destination_path encryption_key num_days

• source_path: The path to the directory that needs to be backed up.
• destination_path: The path to the directory where the backup should be stored.
• encryption_key: The encryption key used to encrypt the backup.
• num_days: The number of days to consider for backing up only the modified files.

The restore.sh script Restores the backup by decrypting and extracting the files in reverse order.

./restore.sh backup_directory destination_directory decryption_key

• backup_directory: The path to the directory where the backup files are stored.
• destination_path: The path to the directory where the restored files should be placed.
• decryption_key: The decryption key used to decrypt the backup files.

The project consists of the following files:

• backup.sh: The main script file for performing backups.
• restore.sh: The main script file for performing restores.
• backup_restore_lib.sh: A library file containing common functions for parameter validation and backup/restore logic.

The scripts rely on the following dependencies:

• tar: Used for creating and extracting tar archives.
• gzip: Used for compressing and decompressing files.
• gpg: Used for encrypting and decrypting files. Ensure that these dependencies are installed on your system before running the scripts.