Backing up your files means keeping at least one extra copy somewhere other than your main laptop, so a broken drive, a lost laptop, or a bad update does not mean losing your photos and documents. The simplest reliable setup is two copies: one on an external drive and one in online storage, updated automatically.
Start with the files you cannot replace
Not every file matters equally. Photos, family videos, work documents, schoolwork, and financial records are hard or impossible to recreate if they are lost. Apps, music you can download again, and temporary files matter far less. Make a short list of the folders that hold your irreplaceable files: usually the documents folder, the pictures folder, and the desktop.
Check where your files are stored before you choose a backup method. If your photos live in a cloud photo app and your documents live on the laptop, you may need two different approaches. Our article on how to choose a laptop for everyday use explains why storage size matters when you buy, and our article on how to speed up a slow laptop in an afternoon explains how to free space before you copy large folders.
Two copies, in two places
The safest simple rule is to keep two extra copies in two different places. An external drive kept at home is fast and works without the internet, but it does not help if the house floods or the drive is stolen with the laptop. Together, the two cover each other's weaknesses.
Choose an external drive with enough space for your important files, plus room to grow.
Make it automatic
- External drive: plug it in once a week, or leave it connected, and let the built-in backup feature copy new and changed files.
- Online storage: turn on automatic sync for your documents and pictures folders, so new files upload without you thinking about it.
- Phone photos: check that your phone backs up its photos too, or the pictures you take will only live on the phone.
- Schedule: pick a regular day for a manual check, such as Sunday evening, and stick to it.
Automatic backup is worth setting up properly, because manual backup is the first chore people drop when life gets busy. Our article on how to keep your laptop battery healthy for years is a useful reminder that a laptop's parts wear out over time, which is exactly why a copy elsewhere matters.
Test the restore, not just the backup
A backup is only useful if you can get files back from it. Every few months, pick one file from the backup and restore it to a different folder, then open it and check that it is complete. Keep your passwords and account details safe as well: our article on strong passwords and passkeys and our article on staying safe online explain how to protect the accounts that hold your backed-up files.
Key takeaways
- Keep at least one extra copy of your files somewhere other than your main laptop.
- Back up irreplaceable files first: photos, videos, work documents, and records.
- Use both an external drive and online storage so each covers the other's weakness.
- Make backup automatic, and check it once a month.
- Test restoring a file every few months, so you know the backup works.
Losing files is rarely dramatic. It is a dropped laptop, a drive that stops working, or a file deleted by mistake and noticed too late. A backup set up in an afternoon, checked once a month, turns those everyday accidents into a minor inconvenience instead of a loss you cannot undo.
Frequently asked questions
How often should I back up my computer files?
Back up important files at least once a week, and set automatic backup on if you can. Files that change daily, such as work documents, should be backed up daily or continuously.
Is online backup enough on its own?
Online backup is a good start, but it depends on your internet connection and your account. A second copy on an external drive gives you access to your files even when you are offline or locked out of an account.
What files should I back up first?
Start with files you cannot replace: photos, family videos, work documents, and financial records. Apps can be reinstalled, but a lost photo or a lost document often cannot be recreated.
How do I know my backup actually works?
Try restoring one file from the backup every few months. A backup you have never tested is only a hope, not a safety net. If the test file opens correctly, the backup is doing its job.
