Can I backup my 3.0.3 charaters and restore them on 3.0.9?

Hi

I would like to know if I backup my characters on my 3.0.3. server can I restore them on my 3.0.9 server ?

Sure.. just have to apply the individual sql updates to your character db untill its updated to the version needed for the core u wanna use.

U can see in table characters_db_version (or something like that) what the last update was that is applied to your characters db..
Then just apply all updates for the characters db that come after that.

Good luck :):