If your goal is to have a backup to serve as a proper disaster recovery store for your data, an off-site or cloud backup is what you need.
If your goal is to have your data available quickly in the event of a local failure (PC hard drive dies, data corruption, etc.), a NAS will get you back on your feet faster. Caveat here is that a machine issue such as a virus could traverse your network and infect data on your NAS.
For personal backups, it's your call. If you run your business off of this machine, I would actually say it's wise to have both options.
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-James
GO FLAMES GO.
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