Question

What is the difference between cloud backup and cloud sync?

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Curated Intelligence
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Answer

Sync keeps the same set of files identical across several places. Backup keeps a separate copy of your files as they were at points in the past. The difference sounds small and is not, because sync faithfully replicates deletion and corruption while backup is specifically designed to survive them.

If you delete a file in a sync folder, it disappears everywhere within seconds. If ransomware encrypts your documents, the encrypted versions replicate. Sync is doing exactly what it promises; it is simply not a safety net, and treating it as one is the single most common data loss story among people who believed they were protected.

Backup keeps historical versions and does not remove a stored copy just because the original vanished. Recovering a file you deleted last week, or restoring the state of a folder before something went wrong, is the function it exists to perform.

Most consumer sync services do include limited version history and a recycle bin, which blurs the line usefully. The limits matter though: retention is often thirty days, and it may not cover every file type or a mass deletion. It is worth knowing your specific service limits rather than assuming.

The practical approach is to treat them as complementary. Sync for working files you access across devices, backup for everything you would be upset to lose. The commonly cited rule is three copies of your data, on two different media, with one kept offsite. Sync provides convenience and offsite presence but only really counts as one copy, because all its instances change together.

For anything irreplaceable, a periodic copy that is not continuously connected remains the strongest protection available.

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