For a replacement phone or computer, start with the backup method supported by its operating system, then check which photos, files, messages, apps and settings it can actually restore. Add an external drive when you need a separately stored local copy or a Mac backup through Time Machine; consider NAS when several devices need managed local backups. A transfer or synchronised folder alone does not establish that everything can be recovered.
The right route depends on whether you are preparing to restore a replacement device, safeguard particular files or manage backups for several devices.
Check what your next device can restore before you erase the old one. Apple, Google and Microsoft describe different backup and migration coverage, so an account sign-in or file transfer should not be treated as proof that every message, app and setting will return.
A copy kept apart from the original device matters if that device is lost, damaged or inaccessible. The National Cyber Security Centre describes both cloud storage and removable media as possible locations for a separate backup.
Compare the amount of data to protect with your available cloud and local storage. An external drive can hold a local copy; NAS may suit scheduled backups across devices if you are prepared to manage its storage, access and own backup destination.
Work backwards from what you would need to recover: the files, the device-specific data and a way to access the backup if the original device is gone.
| Priority | What to check | Your needs |
|---|---|---|
| Separate copy | Choose a backup location apart from the original device. If using a removable drive, decide where to keep it after backing up and how often to update the copy. The National Cyber Security Centre defines a backup as data kept in a separate safe location. | I want my photos and documents available even if the original device is lost or cannot be opened. |
| Restore coverage | Check the destination device, operating-system version and data categories. Apple excludes items already synchronised to iCloud from iCloud Backup; Google says Android restoration varies by phone and version. For Windows Backup, inspect the selected folders and other settings. | Will my messages, app data and settings come back, or do some items need a separate transfer? |
| Storage capacity | Measure the data selected for backup and leave room for growth. Google says its included 15 GB is shared across Drive, Gmail and Photos; Microsoft says its included 5 GB is shared across several account services. Match a local drive’s stated capacity to the files you intend to keep. | My photo and video library may need more space than the allowance attached to my account. |
| Account access | Check that you can sign in and complete account recovery without the old device. Turn on two-step verification for an important backup account; the National Cyber Security Centre says it helps protect an account even if someone knows its password. | If my phone disappears, I still need a workable way to reach its cloud backup. |
| Local setup | For an external drive or USB or SD storage, check the connector, file format and intended device before copying files. For Mac Time Machine on NAS, Apple says the NAS must support Time Machine over SMB or AFP. | I need the saved files to open on my replacement computer, not just fit on the storage device. |
| Several devices | Check whether a NAS supports the backup tasks and access controls your household needs, and plan another destination for the NAS data. Synology describes Hyper Backup destinations including external storage, file servers and cloud services. | Several of us need scheduled local backups, and someone can take responsibility for managing them. |
A transfer helps move data while the old device is available; it does not leave a separately stored copy for a later loss or failure. Google says its Android device-to-device transfer can be performed only once during setup.
Before erasing or handing over the old device, make a separate backup and check that you can access the important files and account.
Apple says information already synchronised to iCloud is outside iCloud Backup. Google says not every Android app backs up or restores all its data and settings.
Check photos, messages, documents and app data as separate categories, then follow the restore instructions for the replacement device.
An account allowance is shared with other services in some ecosystems, while a local drive must have enough space for the files selected for backup.
Check current storage use, decide what needs backing up and allow room for new files before selecting an account plan or drive capacity.
A drive stored with the original device could be caught in the same loss or damage event. The National Cyber Security Centre advises keeping backup data in a separate safe location.
Store the completed removable-media backup separately. For irreplaceable files, consider another independently accessible copy as well.
Platform documentation helps establish what a replacement device can restore; storage-brand features still need checking for the particular product and setup.
Relevant to iPhone and iPad backups and to Mac users considering Time Machine with external storage or compatible NAS.
Relevant to Android replacement through Google Account backup and to files and photos stored in Google services.
Relevant to Windows users moving selected folders and settings to a new PC through their Microsoft account.
Relevant to households prepared to manage backup tasks on a network-attached storage device.
Relevant to shoppers considering a separate external drive for local files.
These drives cover the local-copy side of the decision. Choose one only after checking that it connects to your device and holds the files you need; a drive by itself does not establish a complete phone or computer restore.
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Consider its 4 TB capacity for a separate copy of a large file collection. The listed connection is USB Type-C with USB 3.2 Gen 2x2; check the intended device’s port and backup software before relying on it for a restore. Keep the completed copy apart from the original device.
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This 1 TB option is worth considering for a selected-file copy if that capacity covers your data and expected growth. Its name specifies USB Type-C and USB 3.2 Gen 2; check the connection and the restore method for your device. Store the backup separately when it is not in use.
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The stated 4 TB capacity gives you a figure to compare with the size of your personal-file archive. Check the connector and file format for the computer that will create and read the backup, particularly if you plan to use different operating systems. A file copy is not proof of whole-device restoration.
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This Mac-labelled 5 TB drive is an option to assess for local file storage. Check its format and setup against the Mac and any other computer that needs to read it. If the aim is a Time Machine restore, confirm the backup setup itself rather than assuming the drive’s capacity establishes restore coverage.
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Consider the stated 2 TB capacity for a portable copy of selected files. Confirm the connector and file format against the phone or computer you intend to use, then check that your chosen backup method can restore the data you care about. Keep the finished copy apart from the original device.
No. Apple says data already synchronised to iCloud is not included in iCloud Backup, while Windows Backup can use OneDrive for selected folders. Check which items are synchronised, which are backed up and how each can be recovered before erasing the old device.
No. Google says restoration varies by phone and Android version, and a backup from a higher Android version cannot be restored to a phone running a lower version. Check the replacement phone’s version and the backup coverage of important apps and data.
An external drive can hold a separate local copy of files, or serve as storage for a Mac Time Machine backup when set up for that purpose. Keep it apart from the original device when not backing up, and check the restore method for any phone or computer data that goes beyond ordinary files.
Make sure you can sign in and complete account recovery without the lost phone. Enable two-step verification on the account holding the backup; the National Cyber Security Centre says this helps protect an account even if someone knows its password.