A backup should give you a usable copy when the original disappears, changes unexpectedly or becomes inaccessible. The practical starting point is simple: identify the files you value, copy them through an appropriate backup process to a separate destination, and prove that you can restore a file.
This guide explains the three-copy approach and gives starting points for Time Machine on Mac and File History on Windows 11. It also separates cloud synchronization from recoverability. Seeing the same folder on two devices is useful, but it does not answer every question about accidental deletion, theft or a damaged account.
Instructions were checked on October 25, 2026. The examples are illustrative; we have not benchmarked the pictured drives or tested every computer configuration. For a managed work device, use the organization’s approved backup process and storage destinations.
In this article
- 1. Decide what you need to recover
- 2. Use the 3-2-1 guideline to separate failure risks
- 3. Start a Mac backup with Time Machine
- 4. Start a Windows 11 file backup with File History
- 5. Check what your cloud service does with deletion
- 6. Protect the destination and plan for a missing device
- 7. Perform a small restore test and make the routine repeatable
1. Decide what you need to recover
Make a short inventory before buying storage or enabling a service. Include the folders that actually contain your documents, photographs and other irreplaceable work. Think about files outside the obvious default folders, exports from specialist applications and anything stored only in a particular account.
Write down a recovery question for each group. If the laptop disappeared today, where would you obtain yesterday’s document? If a photograph was accidentally deleted last week, which system could restore it? These are different requirements from simply moving your current files to a new computer.
Choose a tolerable gap between copies. A folder edited every day may need a different routine from a finished archive that rarely changes. This is a planning choice based on what you can afford to lose, not a universal promise that a particular backup interval suits everyone.
Keep the scope modest for a first setup: one clearly identified folder and one separate destination are enough to learn the process. After a successful restore test, extend it to the rest of your inventory and check that each addition is included.
2. Use the 3-2-1 guideline to separate failure risks
CISA describes the 3-2-1 guideline as three copies of important files, on two different types of storage, with one copy kept off-site. Think of the original plus two backup copies. The point is to avoid making every copy dependent on the same device or location.
A fictional home example could pair the working files on a laptop with a versioned backup on an external drive and a separately managed off-site backup. The exact services and media need to fit the files and recovery requirements. This is an example of a design, not confirmation that any arbitrary cloud folder qualifies as an independent backup.
Now test the arrangement against a few failures. Would losing a bag remove both laptop and drive? Would losing one account prevent access to every online copy? Would an unwanted edit replace every current copy? Counting three folder icons is less informative than identifying which failure each copy can survive.
Sources: CISA — Back up business data and the 3-2-1 guideline ↗
3. Start a Mac backup with Time Machine
Apple supports Time Machine backups to suitable external storage. Its current setup instructions for macOS Ventura 13 or later start in System Settings, then General and Time Machine. Choose Add Backup Disk, select the destination and follow setup. Confirm which drive you selected before proceeding.
Apple says setup may ask to erase the destination. Do not approve erasure on a disk containing the only copy of something you need. Select an appropriate different destination or preserve those files first. If you enable backup encryption, retain the recovery password securely; Apple says it will be needed for restoration.
After setup, let the initial backup complete and inspect its status. Apple documents a manual backup option and a menu showing progress or the latest backup date. Treat that completion information as the start of verification, then perform the restore exercise described below.
Keep a note of what you expect this backup to cover. A successful status message is useful evidence about the configured job; it does not replace checking your own important files and exclusions.
Sources: Apple Support — Back up your Mac with Time Machine ↗
4. Start a Windows 11 file backup with File History
Microsoft’s File History instructions use an external drive or a network location. In Control Panel, under System and Security, open the File History backup option and turn it on. Use the drive-selection control if the intended destination is not already selected.
File History protects files in libraries, including common personal folders. Microsoft explains how to include additional folders in a library. Check the real paths from your inventory rather than assuming every file on every disk is covered. This is a file-backup workflow, not a claim that you have created a complete recovery image of the computer.
For restoration, Microsoft documents opening the original folder’s previous versions and choosing an available saved version. It also describes restoring to another location. That is useful for a test because restoring directly over the current file can replace it. Inspect the destination before completing the operation.
Once the job is running, create a small test document in an included folder. Allow it to enter a completed backup, then check that the expected saved version can be found. A selected destination and an enabled switch are not the same evidence as a recoverable file.
Sources: Microsoft Support — Backup and restore with File History ↗
5. Check what your cloud service does with deletion
Synchronization keeps locations aligned. Backup and recovery requirements ask what you can obtain after a mistake or loss. A service can offer both synchronization and recovery features, but you need to inspect those features rather than infer them from the existence of an online copy.
Google’s Drive documentation gives a concrete example: when files are mirrored or streamed between Drive and a computer, putting a file in the trash puts it in the trash everywhere. Its documentation also distinguishes the behavior of uploads to Google Photos. Those are different arrangements, so identify which one you are actually using.
For your chosen service, check how deleted files and older versions can be restored, how long recovery remains available and which account can perform it. Also confirm that the files you intend to protect have actually reached the destination. An online-only indicator or a shared link does not describe a complete independent recovery plan.
Use a deliberately disposable test file to learn the service’s behavior. Keep valuable originals intact while you check the documented recovery process. If you cannot explain how an unwanted change would be reversed, leave that part of the plan marked unfinished.
Sources: Google Drive Help — Deletion and synchronized files ↗
6. Protect the destination and plan for a missing device
The NCSC advises disconnecting removable backup media when it is not in use, because malware can affect attached storage. It also recommends protecting backups with a password where that option is offered and securing cloud accounts with strong authentication. Apply those measures to the actual destination you chose.
Encryption and separation solve different problems. Encryption helps protect stored data from unauthorized access; separation reduces the chance that one incident reaches every copy. You still need a workable way to unlock and restore the backup. Keep recovery instructions somewhere that is not dependent solely on the device whose loss you are planning for.
For an online destination, rehearse how you would regain access from another approved device. Our passkey guide explains why account credentials and their recovery paths need deliberate planning. A perfectly preserved backup is of limited use while you cannot reach its account or unlock its contents.
Sources: UK NCSC — Backing up important data and protecting backup media ↗ · Related Trevioniq guide — Account recovery and passkeys ↗
7. Perform a small restore test and make the routine repeatable
Use a test document, photograph and any other important file type from your inventory. Record which completed backup should contain them. Restore copies into a separate test location using the documented procedure, then open them in the appropriate application and compare the contents with what you expected.
Include an older version if version recovery matters to you. Restoring today’s copy answers a different question from recovering the state before an unwanted edit. Note any missing folder, unsupported file type or access problem and correct the scope before calling the setup complete.
Keep a simple record: protected folders, destinations, last completed job and last successful restore test. Recheck it after changing computers, moving folders, replacing a drive or changing a cloud account. A reasonable routine is one you will actually maintain and can inspect.
Your first useful milestone is therefore concrete: an important file has reached a separate destination and a test copy has been restored successfully. Build from that result, adding the additional copies and separation your plan requires. The aim is a recovery process you understand, rather than a collection of storage devices you hope will help.
Sources: UK NCSC — Backing up important data and protecting backup media ↗