A reliable backup means keeping at least three copies of your important files, on two different kinds of storage, with one copy stored away from your computer. That's the 3-2-1 rule. For most people in India it means the files on the computer, a copy on an external SSD or hard drive, and a cloud copy such as OneDrive or Google Drive, plus an occasional test restore.
Most people only think about backups after losing something. A drive fails, a laptop is stolen, ransomware locks the folder, or a repair needs a full reset. The cost of a backup is an hour of setup. The cost of no backup can be years of photos or a business's accounts. Here's a practical plan you can finish today.
What is the 3-2-1 rule, and why does it work?
The rule, popularised by photographer Peter Krogh, is simple. Keep three copies of your data: the original and two backups. Store them on two different types of media, for example the laptop's internal drive and an external drive. Keep one copy somewhere else, such as in the cloud or at another address. Each part protects against a different disaster. Two copies on one desk won't survive a fire, a theft or a power surge that takes out both.
One common mistake deserves its own warning: syncing is not backing up. Services such as OneDrive and Google Drive mirror your folder. If you delete a file, or ransomware encrypts it, the damage syncs to the cloud too. Version history can rescue you, but only for a limited time. Use sync as one layer, not as the whole plan.
Which files should you back up first?
You don't need to copy everything. Programs can be reinstalled. Your own work can't. Start with this list and add to it.
- Documents, Desktop and Downloads folders.
- Photos, videos and anything from a camera or memory card.
- Accounting and business data, such as a Tally data folder or spreadsheets.
- Email archives, for example local Outlook data files.
- Browser bookmarks and a password manager export, stored securely.
- Licence keys, installers for paid software and project files.
How do you set up a backup on Windows 11?
Windows 11 offers two built-in routes, and using both gives you two layers.
- Windows Backup to the cloud. In Settings, Accounts, Windows backup, you can back up your Desktop, Documents and Pictures folders to OneDrive. It's quick, and it protects against theft and drive failure.
- File History to an external drive. Plug in an external drive, open Control Panel, File History, and turn it on. It saves versions of your files at regular intervals, so you can go back to an earlier version.
- Add a manual copy. Once a month, drag your key folders onto a second drive that you keep disconnected. This copy is safe from ransomware, because it isn't attached when an attack happens.
- Consider an image backup if you need the whole system, including programs, restorable after a total failure. It takes more space, and it's useful for business machines.
What about a Mac?
Time Machine is built in. Connect an external drive, choose it in System Settings, and macOS backs up automatically every hour, keeping hourly copies for a day, daily copies for a month and weekly copies until the disk is full. Add iCloud Drive or another cloud service for the off-site copy.
Which backup storage should you choose?
Each option has a strength and a weakness. The best plan combines two.
| Option | Strengths | Weaknesses |
|---|---|---|
| External hard drive | Lots of space for the money | Moving parts, fragile if dropped, and still in the same room |
| External SSD | Fast, small, tolerant of knocks | Costs more per terabyte |
| Cloud storage | Off-site, automatic, keeps versions | Needs a good connection, ongoing cost, privacy considerations |
| NAS box at home or office | Shared by several computers, automatic | RAID protects against a failed disk, but is not a backup by itself |
| Pen drive | Handy for single files | Easily lost, wears out, a poor sole copy |
If you're choosing a drive, our guide to the best external SSDs for backup compares current options.
How do you know the backup actually works?
An untested backup is a hope, not a plan. Take five minutes each quarter to check three things. Open a handful of files from the backup, confirm the last backup date is recent, and make sure the backup is still running. A drive that quietly filled up or got unplugged months ago is a classic way to discover the problem at the worst moment.
Protect the backup itself. If it holds sensitive data, encrypt the drive, for example with BitLocker To Go, and store the recovery key separately. Keep one copy offline. And remember that backup drives wear out too, so replace them every few years rather than waiting for them to fail.
What if your drive is already showing trouble?
Don't wait to build a tidy system. Copy the irreplaceable files first, to a different drive, in small batches. Clicking, freezing or disk errors mean the clock is running. Read our guide to the signs of a failing hard drive, and if the laptop won't start, see how to recover data from a dead laptop.
Planning a repair? Back up beforehand, because some repairs, such as a storage replacement or a reset, can't promise your files survive. Our checklist on backing up a laptop before repair covers what to copy. If you'd rather not do it yourself, we can help with data backup and moving files to a new machine through data transfer.
Which backup mistakes catch people out most often?
Most failed backups don't fail because of technology. They fail because of small habits that nobody noticed. Check yourself against this list.
- Leaving the backup drive plugged in all the time. A power surge, a theft or ransomware then reaches the original and the copy together.
- Keeping the backup in the laptop bag. If the bag is stolen or soaked, both copies go with it.
- Trusting RAID or a mirrored drive. Mirroring protects against one disk dying, but it copies accidental deletions and encryption just as faithfully.
- Letting a free cloud allowance fill up. Many services quietly stop syncing when space runs out, and the warning email goes unread.
- Backing up the wrong place. Some programs keep data outside Documents, so check where your accounting software and mail program really store their files.
- Starting only after trouble begins. By then the drive may be too unreliable to copy from safely.
A simple rotation for a shop or small office
Business data deserves a routine that survives forgetfulness. Use two external drives, label them A and B, and swap them each week. One stays plugged in for the automatic nightly backup, while the other sits at a different address, such as the owner's home. Add a cloud copy of the accounts folder, and once a quarter restore a file from each copy to prove it works. It isn't glamorous, but two inexpensive drives cover theft, fire, ransomware and a failed disk.
Frequently asked questions
How often should I back up?
Match it to how much work you can afford to lose. For documents you edit daily, automatic daily backup is sensible. For family photos, backing up after each event or monthly is enough. Automatic beats manual because it doesn't depend on memory.
Is Google Drive or OneDrive a backup?
It's a useful off-site copy, but sync mirrors deletions and encryption. Treat it as one layer and pair it with a separate backup on an external drive.
How much storage do I need?
At least the size of the folders you're backing up, plus room for older versions. Buying a drive two or three times larger than your data gives comfortable headroom.
Can you set up backups for me?
Yes. We can set up a backup routine, transfer files to a new computer and check that the restore works. A written quote comes first, and our pricing page has indicative rates for related services.
Not sure where to start? Book a free pickup or message us, and we'll help set up a backup that fits how you use your computer.
