Should I be saving the Required EXP to level up?

Hi, so currently I’m finishing a Level System, Containing the Basics, Level, EXP, and REXP (or Required EXP), and I have seen people saving the REXP needed for you to level up in some games or systems, while with the current system I made, It does it without saving the REXP, and just applyed the Value based on Level they have when the Join back, which also works, So now I’m wondering if I should be saving it?

If your “REXP” is systematically generated, then no. Games that do save this data are adaptive, so one user gets a different REXP than another, even if they are the same level.