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What kind of backup do you want? OS, applications, and data? Just your user data?
If you want a full system image, external hard drive and clonezilla. If just your data, external hard drive and just copy your user directory.
Personally, I keep my user data on a RAID-1 array to protect against disk failure, OS and apps on another drive. Truly critical files I have copies of in multiple places, most of which also live on a RAID array.
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