Backup vs cloud sync: why OneDrive and Google Drive aren't enough

Millions of small businesses use OneDrive, Google Drive or Dropbox and believe their data is safe. It's one of the most expensive misconceptions in business IT. Cloud sync is not backup — and the difference matters enormously when an attack or an accident happens.

What cloud sync actually does

OneDrive, Google Drive and Dropbox work like a real-time mirror. Anything you change on your computer appears in the cloud immediately. That's their stated purpose: giving you access to your files from any device.

The problem arises when the change is unwanted:

• Ransomware encrypts the files on your computer → sync immediately uploads the encrypted versions to the cloud → within minutes you've lost both the local copy and the cloud copy
• You accidentally delete a folder → it's automatically deleted from the cloud too
• An employee overwrites an important document → the old version disappears from the sync

Sync services keep historical versions, but for limited periods (30 days on standard OneDrive, 180 days on premium plans) and with recovery restrictions that aren't intuitive under stress.

What a real backup does

A professional backup works fundamentally differently:

• It's isolated — not permanently connected to your network. Ransomware can't reach it and encrypt it in real time.
• It keeps multiple versions — not just the latest copy, but dated versions going back months or years, with daily or hourly granularity.
• It's tested — restores are checked regularly. You know it works before you need it.
• It's monitored — you get an alert if a backup fails, instead of finding out in the middle of an incident.

The ransomware scenario compared

With OneDrive: Ransomware infects the computer at 09:14. It encrypts every file in the synced folder. OneDrive syncs the encrypted files to the cloud. By 09:22, both the computer and the cloud contain unusable data. Recovery from OneDrive's version history is technically possible, but it takes time and technical knowledge, and isn't guaranteed for every file.

With professional backup: Ransomware infects the computer. The local data is encrypted. The local NAS with immutable snapshots is unaffected — the attacker can't overwrite the snapshots even with network access. The encrypted offsite cloud backup is completely intact. You restore from the last valid snapshot — usually losing less than 24 hours of data.

When cloud sync makes sense

We're not arguing against OneDrive or Google Drive — they're excellent tools for what they're designed to do: collaboration, remote access, file sharing. Keep using them for that.

But don't confuse them with data protection. A complete strategy includes both:

• Cloud sync — for productivity and mobile access
• Isolated, versioned backup — for recovery after an incident