The data may be intact after a billion years, but the “language” and “syntax” of the data will be long-forgotten and the data will be incomprehensible to anyone later on... LOL...
Also, the “reader device” may not even be around any longer, either, not to say anything about the protocols for transferring the data to an intelligent device to “see” it...
Not to mention that over a billion years evolution will have occurred to such an extent that our descendants will have evolved into beings that do not resemble us in the slightest. Our thoughts will seem as sophisticated to them as the thoughts of squirrels seem to us.