you might want to search the forum for a thread where 8999 lost btc are mentioned.
poor man used same paranoid setup and didnt backup his wallet after each and any transaction.
now to your question: i myself wouldnt trust usb sticks too much. Having above mentioned case in mind, you need more backups, why not on a system with FullDiskEncryption, Harddisk tied to mainboard via TPM (bitlocker?, dont know what linux can offer there)
If you want the usb stick badly, you could boot off it ?
Maybe there are encrypted sticks working with fingerprints which can be unlocked prior to the boot process ? dunno about that
thanks for the reply. I am absolutely aware of the 8999 lost btc thing. Backup of a stick WOULD take place. Just from another OS: creating an image and put it online, on cd's etc. If the USB stick dies I would just take the image and rebuild another stick using that image
I don't trust booting from a stick. Why? There is not persistence. Someone could happily install any software on it (keylogger or whatever). With a CD you have your signature on it, maybe you check the hash.. but you are damn shure the OS is the same as before.
The FullDiskEncryption is intersting, I will look up that, thanks!