How iOS 15 Temporary iCloud Backup Works

With the release of iOS 15, Apple introduced a feature that grants users free, temporary iCloud storage to ensure a seamless data transfer when switching to a new device. This update removes the barrier of iCloud storage limits, allowing anyone to create a full cloud backup without purchasing a higher-tier iCloud+ subscription. The following sections detail how this backup process works, its duration, and the practical updates it brought to device migration.

Unlimited Temporary Storage

Prior to iOS 15, users with the free 5GB iCloud tier often lacked the necessary space to back up their entire device to the cloud, forcing them to use physical computer connections or direct peer-to-peer Wi-Fi transfers. With iOS 15, Apple provides as much iCloud storage as required to complete a full device backup, completely free of charge, specifically for migrating to a new iPhone or iPad.

21-Day Availability Window

The temporary backup does not stay on Apple's servers indefinitely:

  • Initial Period: Once the backup is initiated, users have 21 days to complete the transfer to their new device before the temporary backup expires and is permanently deleted.
  • Extension Option: If a replacement device is delayed or shipping takes longer than expected, users can request an additional 21 days through the Settings app before the original window closes.
  • Post-Transfer Cleanup: Once the data is successfully restored onto the new device, the temporary backup is automatically removed, and the user's iCloud storage returns to its standard tier limit.

Streamlined Setup via "Transfer or Reset"

iOS 15 reorganized the settings interface to make this process intuitive. Under Settings > General > Transfer or Reset iPhone, Apple added a Prepare for New iPhone prompt. Selecting Get Started triggers an automated readiness check that:

  1. Scans existing iCloud settings and determines which data types are not currently synced.
  2. Turns on backup functionality for all local data, including apps, app data, settings, and media.
  3. Automatically completes the backup in the background once connected to Wi-Fi and power.

Automatic Upgrade Prompts for Pending Backups

If a user purchases a new iPhone, the setup process uses this temporary cloud backup automatically. During initial setup, placing the new device near the old one prompts the Quick Start screen, which can pull the temporary backup straight from the cloud. This ensures that even users with broken, lost, or traded-in old devices can restore their data without owning an expanded iCloud plan.