the cloud function in preferences is made for that, save files are fine, but renpy limitations deem the persistent.sav too big and will omit it in the transfer (it contains the gallery data)... send it to a dropbox, SD card, or on your Discord, so you can paste it on your pc to overwrite the new persistent.sav that generates once you launch the gayme (or, well, you can re-unlock the gallery yourself fast if you have saves in various parts of the gayme, or use the cheat code if you are a $5 patron, but that unlocks everything)