Backing up your data — the simple guide

Most people think about backing up their data the moment they lose it. A laptop dropped, a phone stolen, a hard drive that stops working one morning with no warning. The files, photos, documents and messages that took years to accumulate — gone. It is one of those situations where the advice feels obvious in hindsight and completely irrelevant until it happens to you.

The good news is that backing up your data is far easier now than it was a decade ago. The bad news is that most people still are not doing it properly, or are doing it in a way that would let them down when it actually matters.

The core idea behind a good backup is that your data should exist in more than one place. A single copy of anything — even on a device that has never given you trouble — is a single point of failure. Hard drives, including the fast solid-state ones in modern laptops, do fail. They fail without warning and without mercy. So do phones. So does the one external hard drive you bought in 2019 and have not thought about since.

The phrase you will encounter if you read about this subject is the 3-2-1 rule. Three copies of your data, on two different types of storage, with one copy stored off-site. That sounds more complicated than it is. In practice, it often means: your original files on your main device, a copy on an external drive at home, and a copy in cloud storage somewhere else. That third copy — the one that lives off-site — is what saves you if your house is burgled or flooded. It sounds dramatic, but it is the whole point.

Cloud backup is the simplest starting point for most people. iCloud, Google Drive and Microsoft OneDrive all offer automatic backup for your most important files and photos, and all three have free tiers that give you a meaningful amount of storage. Apple’s iCloud gives you 5GB free, which is not much. Google One starts at 15GB free across Gmail, Drive and Photos. OneDrive gives Microsoft 365 subscribers 1TB, which is generous. If you are already paying for a Microsoft or Google subscription, the cloud storage is likely included and worth setting up properly if you have not already.

The key thing with cloud storage is that it needs to be set up to sync automatically. Simply having a OneDrive or Google Drive account is not the same as having your files backed up. You need to check that the folders containing your actual documents and photos are included in the sync. On Windows, this usually means making sure your Desktop, Documents and Pictures folders are pointed at OneDrive. On a Mac with iCloud, you can do the same thing through System Settings. It takes about five minutes and then happens in the background without you needing to think about it again.

For photos specifically, Google Photos remains one of the most reliable and comprehensive options available. It backs up your phone’s camera roll automatically whenever you are on Wi-Fi, and the search and organisation tools are genuinely impressive. Apple’s iCloud Photos does the same job for iPhone users who are already in the Apple ecosystem. The important thing is to pick one and make sure it is switched on.

Cloud storage handles the off-site requirement neatly, but it is still worth having a physical backup as well. An external hard drive, or a network-attached storage device if you want something more robust, gives you a local copy that you can access quickly without needing an internet connection. For most households, a portable external drive in the range of 1 to 2 terabytes is more than enough and costs somewhere between £40 and £80. Western Digital and Seagate are the names you will see most often, and both are perfectly reliable for this purpose.

If you are on a Mac, Time Machine is the built-in backup tool and it works well. Plug in an external drive, tell Time Machine to use it, and the Mac backs up automatically every hour in the background. You will not notice it happening, and if your laptop ever fails you can restore everything exactly as it was. Windows has a similar feature called File History, though it requires a bit more setup. There are also dedicated backup programmes such as Backblaze Personal Backup, which costs around £7 a month and backs up your entire computer to the cloud continuously. For people with a lot of data or who do not want to manage physical drives, it is one of the cleanest solutions available.

One thing worth understanding is the difference between backup and sync. Dropbox, Google Drive and iCloud are sync services: they keep your files consistent across devices, but if you delete a file on one device, it disappears from all of them. Most services keep deleted files recoverable for 30 days, so it is not the end of the world, but sync is not the same as backup. A proper backup keeps a historical copy of your files even after you have deleted them from your main device.

For small businesses, the stakes are higher. If your accounting files, client records or project work are stored only on a laptop that gets lost or fails, that is not just inconvenient. It can be genuinely damaging. The principles are the same: cloud sync for convenience, an additional backup for safety, and at least one copy that is not stored in the same physical location as your main device. Many businesses use services like Microsoft 365 with SharePoint or Google Workspace, which provide cloud storage as part of the subscription. These are worth using properly rather than just as an email service.

Getting started today takes less time than you might think. Pick one cloud service, check that your important folders are syncing to it, and order an external drive if you do not already have one. That alone puts you in a significantly better position than most people. The test of a backup system is whether it would save you if everything went wrong tomorrow. It is worth spending an hour to make sure the answer is yes.