Store tool data separately?

first im just going to say i do need help with scripting, i dont have a script for this question because i dont know how to even start with what im trying to do so pls dont accuse me of trying to get free scripts.

What im trying to do is make a vault type item in a game im working on. the vault is going to be used to store things in it like weapons or tools. ill make a gui that when you open the vault you can select and add items from your inventory into the vault. what the vault will do is then store the item into a datasore value and keep it there. So even if the player leaves and he joins another server he can access the vault and grab his tools. ive tried going on many websites and tried finding out how i can do this but i cant fine anything that relates to what im doing. if anyone know how to do this please explain it to me and possibly give a sample script so i know what to do.