Hello,
I have a very noob question ...
I have to change my computer by the end of the year.
It's OK if I take a static on my actual computer, I just have to import the private key of my static wallet on the new one ?
Imo, it would be better if you take the encrypted wallet backup file in the .dat format and import it on your new computer. You should save the private key in any case for extra precaution but just transferring the wallet data file should be sufficient.