Syncing only when connected to Wi-Fi refers to a device or application setting that restricts data uploads and downloads exclusively to wireless internet networks. This prevents automatic synchronization over mobile data connections. Unlike unrestricted syncing, which uses any available internet connection, Wi-Fi syncing explicitly avoids consuming mobile data allowances. It provides control over data usage by leveraging only local wireless networks for background tasks like backups or updates.

Common applications include email apps configured to fetch new messages only on Wi-Fi to prevent exceeding data caps. Cloud backup services like Google Drive or iCloud often offer this option, letting users upload photos or files automatically solely when connected to home or office Wi-Fi, avoiding mobile data charges for large transfers.

The main advantage is significant data savings and cost control for limited mobile plans. However, this approach delays syncing when Wi-Fi is unavailable, potentially causing outdated information if devices aren’t regularly connected. This intentional data constraint balances convenience and cost, enabling responsible usage while supporting seamless updates where affordable connectivity exists.