[rodgerd]

Malware authors are already adding hooks to delete data from Glacier, Netbackup, and other popular backup tools. If it's online, it's toast.

[dragontamer]

I guess for the truly paranoid, LTO / Tapes have that "Write-Once Read Many" feature if you really were worried about some virus overwriting your stuff.

[rodgerd]

Well, tapes have the ability to be easily removed, which is their killer feature vis-a-vis malware.