The risk of someone compromising your Google drive is much more likely than someone randomly finding your private key.
Yes I agree, but my private key are BIP 38 encrypted or my seeds are on txt file and AES encrypted on google drive
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That's another risk: malware could patiently wait until your computer goes online again. Using a LIVE Linux DVD that runs only from memory (obviously offline) is much safer.
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That's what I am fearful of. I have only one computer. If I buy new computer, it will always need to be connected to internet for OS update. Any ideas?