It's not exactly cheap to always have a backup that you know works. You have to set it up and test it periodically. Of course, that doesn't mean you shouldn't do it.
They can still be smart for off-site backups in case of local catastrophic issues (like your house burning down). But they are just part of the solution and shouldn't be a single point of failure.
Agreed, but making your own redundant backups is difficult and with plenty of pitfalls.
Do you keep your backup at home? It would be destroyed in the fire. Do you sync to some offsite which isn't the cloud? Who maintains it? How often do you do test your backups?
What do you plan to do when it breaks down? One of the nicest features of these services is the fact it's backed up very well, usually in multiple copies and locations.
You can keep your recent backups in a fast access location for disaster recovery. It would be a good place to keep older backups though that you don't need to access in an emergency.
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