Cloud sync tools (Dropbox, Google Drive, OneDrive) feel like backups because your files exist somewhere else — but sync and backup are different concepts, and the difference matters exactly when something goes wrong.
Sync tools mirror changes in near-real-time, which means if a file gets corrupted, ransomware-encrypted, or accidentally deleted locally, that same change often syncs to the cloud copy too, sometimes within seconds. A true backup takes point-in-time snapshots you can roll back to, specifically so a bad change doesn't destroy every copy simultaneously.
Ransomware encrypting local files is the clearest case where the sync-versus-backup distinction stops being theoretical: a sync tool faithfully propagates the encrypted, now-unreadable version of every file to the cloud, overwriting the good copies that were there before, often before anyone notices what's happening. A versioned backup, by contrast, retains the pre-encryption snapshot specifically because it doesn't overwrite history the way sync does — which is the entire reason backup software exists as a distinct category rather than being redundant with sync.
Scheduled, versioned snapshots that let you restore to a specific point in time — not just "the current synced state" — plus full system image backups that let you restore an entire machine, not just individual files, if a drive fails completely.
For casual personal use with low-stakes files, sync's convenience may outweigh the gap — the risk is real but the consequences of hitting it are manageable. For business data, financial records, or anything genuinely irreplaceable, that gap is the entire reason backup software exists as a separate category.
Sync for convenience and access across devices, dedicated backup software for actual disaster recovery — running both isn't redundant, they're covering different failure modes. Testing an actual restore at least once, rather than only confirming backups are being created, is the step most people skip and the one that actually matters when a real failure happens.
A commonly cited baseline for genuinely resilient backups is three total copies of important data, on two different types of storage media, with one copy kept offsite or disconnected from the primary system. A sync tool alone typically provides something closer to two connected copies on similar infrastructure — better than nothing, but short of that baseline specifically because a connected, always-syncing copy doesn't protect against the failure modes (ransomware, accidental sync of a bad change) that an offline or versioned copy does — the offsite or disconnected copy is what actually breaks the chain that lets one bad event destroy every copy at once, which is exactly the scenario a sync-only setup remains vulnerable to no matter how reliable the sync itself is.
A reasonable minimum setup without over-engineering is continuing to use sync tools for day-to-day file access and collaboration, while adding one dedicated backup service configured to run automatically on a schedule with a retention window of at least several weeks. This single addition closes most of the practical gap for a small business without requiring a full enterprise-grade backup strategy.
