You delete a file on your laptop, and soon it disappears from your phone too. For synchronization, that may be exactly the intended behavior: changes should reach every device. Agreement between devices alone does little to protect against an accidental deletion. What matters is whether an earlier state remains recoverable and how long that recovery path stays available.
Recognize the two jobs
Synchronization keeps selected contents aligned across locations. Backup should enable recovery when working data is lost or changed incorrectly. A product can combine both functions, but its label does not explain which historical states are actually retained.
Inspect the service's specific features. Is there a recycle bin, version history, or a whole-collection recovery function? What restrictions apply to your account? Record relevant retention periods and test the process. Do not assume every visible file is fully stored locally.
Try a harmless deletion
Create an unimportant test file with recognizable contents. Wait for synchronization to complete and inspect it on a second device. Then edit or delete it and observe how the collection changes. Do not use a file that other people depend on.
Now try to recover the original through the intended recovery method. This reveals the steps and access required. It does not prove that every large or damaged collection will recover just as quickly, but it exposes a basic gap before important material is affected.
An error discovered later
Imagine accidentally overwriting an entire section of an address list. Every device correctly receives the change. Two weeks later, someone notices the missing entries. Synchronization has done its job, but the current copy on the second device does not help recover the lost section.
You need a usable version old enough to precede the mistake. Check not only whether the service offers version history, but whether it covers the required period and file type. An additional backup can supplement that route. The appropriate arrangement follows the likely error and when it might be discovered, rather than simply counting the devices shown in an account.
Add a separate recovery layer
For irreplaceable data, an additional separate backup can provide a useful fallback. It should not silently mirror every unwanted change immediately. With an external drive, check coverage and retained versions; with another service, also check independent account access.
An extra copy only helps when its contents are complete and readable. Download originals where needed and test restorations. Record which system serves which purpose. That makes it clear where active work happens and where to look for an earlier usable state after an error.