Choose a backup around what you would need to recover, where you would recover it, and how quickly you need access.
Define the loss scenario
Consider separate problems: deleting a file, losing the computer, and needing an older project version. Write down the most important folders and who knows where they are. A backup plan should answer those scenarios explicitly instead of relying on a general feeling that files are “in the cloud.”
Compare constraints
Microsoft describes both cloud and external storage options for Windows backups. For your own plan, consider internet access, upload time, storage size, physical storage location, and account access. Neither option is useful if it excludes the folders that matter. Verify the scope in the tool you choose.
Budget the whole arrangement
Include recurring fees, the price of drives, and any replacement equipment you need. Compare a full year of use and the time needed to maintain it. For important files, consider how the plan behaves when one account or storage device is unavailable. Document the choice so another trusted person could understand it if necessary.
Test recovery
Select a harmless test file, make sure it enters the backup, and restore it to a different location. Open it and compare it with the original. Do not delete your only copy to perform a test. Repeat after changing tools or accounts. The result you want is evidence that a needed file can be recovered, not only a success notification.
Estimate recovery time before you need it
For an illustrative 100GB restore over a sustained 20Mbps connection, transferring the data alone takes about 11.1 hours in decimal units: multiply 100GB by eight to convert to gigabits, then divide by 0.02 gigabits per second. Real recovery may take longer because of overhead, service limits, and interruptions. This is a planning calculation, not a measured provider speed.
An external backup may avoid that download, but only if the drive is available and working when needed. A cloud copy may help when local equipment is lost, but account access and recovery credentials still matter. Compare each arrangement against the loss scenario you wrote down. For valuable files, different independent copies can address different failure cases, provided you verify their scope and recovery process.
Sources & method
AI-assisted editorial guidance checked against the primary references below. Examples are illustrative exercises, not results from product tests. No hands-on testing or independent performance measurement is claimed.