The Idea First
Three copies, two places, one far away
The rule most of the industry works to is called 3-2-1, and it sounds technical until you translate it. Three copies of anything you care about, kept on two different kinds of storage, with one copy somewhere other than your building.
The working file on your PC is copy one. A copy on an external drive sitting next to the PC is copy two, and it covers the ordinary disasters: a failed drive, a deleted folder, a corrupted file. A copy in the cloud or on a drive stored at another address is copy three, and it covers the events that take the whole room at once, meaning fire, flood, burglary and ransomware. Each layer covers something the one below it cannot.
The failure we see most often is people who believe they have a backup and have a sync instead. OneDrive, Dropbox and Google Drive mirror your files to the cloud, which is genuinely useful, and it is not the same thing. Sync propagates whatever happens. Delete a file and the deletion syncs. Let ransomware encrypt a folder and the encrypted versions sync. Save a bad version over a good one and the bad version syncs. Sync moves your problem to the cloud at the speed of your internet connection.
Backup means something different: a separate copy, taken at a point in time, that today’s mistake cannot reach. Set up both. Sync for convenience and access across devices, backup for recovery. If you want this designed properly for a business, that is what our backup and recovery service does, and it is a great deal cheaper than the data recovery conversation that follows a failure without one.
A backup nobody has restored from is a hope, not a backup
Restore one file on purpose, today, while nothing is wrong. It is the only way to find out that the drive was never actually writing, or that the job stopped running months ago. Step six below takes two minutes.