As others have said It does not hurt to have a backup drive for your backup drive. I have a 3Tera that I copy from my main 1Tera backup drive everything!
Both data and images. Both my kindles and my nexus 7 are backed up to both drives.
Have learned the hard way never to rely on just one device, because if it can go wrong,, it will. Ether self inflicted or not, stuff does get lost or destroyed or erased.
As far as backing up into the cloud. If you do not hold it,,,you do not own it!
Plus computer/tablet disasters can happen in places where there is no net/cloud available for the save.
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