Fix: Doesn't automatically switch to alternative disks if the primary fails during configuration #1928
Description
Laravel Backup package fails completely when any configured backup destination becomes unavailable due to network issues, storage problems, authentication failures, or service outages.
Current Problem:
- If any primary backup disk fails, the entire backup process fails
- No automatic retry mechanism for alternative storage destinations
- Users must manually intervene to switch to alternative backup locations
- Critical backups may be lost during infrastructure issues
Caused Problem Scenarios:
- AWS S3 outage
- Network connectivity
- Storage quota exceeded
- Authentication issues
- Service maintenance
Need to be this correct scenarios:
- Success Case: User gets BackupWasSuccessfulNotification (whether primary or fallback disk succeeded)
- Failure Case: User gets BackupHasFailedNotification (only if ALL disks including fallbacks failed)