Short answer: cloud (online) backup automatically copies your files to secure servers over the internet, so if your computer is lost, stolen, broken, or hit by ransomware, your data is safe off-site. For a whole computer, an unlimited-per-device service is best value; for a few key files, cloud storage works. Here is how it works, what to look for, and how to set it up.
How cloud backup works
You install a small app that runs quietly in the background, continuously copying your chosen files (or your whole drive) to the provider's encrypted servers. If disaster strikes, you download your files back, or the provider can even mail you a drive for large restores. It is the off-site copy that protects you against fire, theft or a dead disk.
What to look for
| Feature | Why it matters |
|---|---|
| Unlimited (per computer) | Best value for lots of data |
| Version history | Recover from ransomware/mistakes |
| Automatic/continuous | You never forget to back up |
| Private encryption | Only you can read your data |
| Easy restore | Download or mailed drive |
Popular services
- Backblaze: simple, unlimited per computer, great value for backing up an entire PC.
- IDrive: covers multiple devices on one plan.
- Cloud storage (Google Drive, Dropbox, OneDrive): better for syncing chosen files than full-computer backup.
(CrashPlan pivoted to business-only years ago, so for individuals the above are the go-to options now.)
Cloud backup vs cloud storage
They are different: backup automatically protects everything for disaster recovery; storage syncs specific files across devices. Many people use one of each, backup for safety, storage for working files.
Set it up right
- Choose a service and install its app.
- Select what to back up (whole drive, or key folders).
- Turn on continuous/automatic backup.
- Enable private encryption if offered, and record the key safely.
The non-obvious tip: use the 3-2-1 rule, cloud is your off-site copy
Cloud backup is powerful but should be one part of a plan: 3 copies, 2 media types, 1 off-site. In practice, your PC, a local image on an external SSD, and cloud backup as the off-site third. The local copy makes everyday restores fast; the cloud copy survives fire, theft or flood. And whatever you choose, test a restore once so you know it actually works.
Frequently asked questions
What is cloud backup?
An app that automatically copies your files to secure online servers, so your data survives if your computer is lost, stolen, broken or hit by ransomware.
What is the best cloud backup for a whole computer?
An unlimited-per-computer service like Backblaze offers the best value for backing up an entire PC. IDrive is good for covering multiple devices.
Is cloud backup the same as Google Drive or Dropbox?
No. Backup automatically protects everything for disaster recovery; storage like Drive syncs chosen files. Many people use one of each.
How should cloud backup fit my overall plan?
Follow 3-2-1: three copies, two media types, one off-site. Use your PC, a local external-drive image, and cloud backup as the off-site copy, and test a restore.
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