Question : how to backup and restore antivirus update

hi,
i m using NOD32 antivirus of ESET.it is getting regularly updated.Now i want to format my computer.so the nod32 should hv to be installed again.

my question is...how i can save the updates and after reinstalling NOD32 how i can restore that virus database signature with NOD32..
thanks

Answer : how to backup and restore antivirus update

Where is the problem in downloading it once more after reinstallation?