Add backup and restore functionality

[scottbrown]

Problem

No mechanism to backup existing configurations before installation or restore previous states if issues occur.

Solution

Create backup and restore system:

• backup.sh - Create backups of existing configurations before installation
• restore.sh - Restore configurations from backup
• Versioned backup system with timestamps
• Integration with bootstrap process

Benefits

• Safe installation process with rollback capability
• Protection against configuration loss
• Confidence when making changes
• Easy recovery from failed installations

Implementation Notes

• Create timestamped backups in dedicated backup directory
• Support selective backup and restore of specific packages
• Integrate backup creation into bootstrap scripts
• Provide clear documentation for backup/restore process
• Consider compression for space efficiency