I keep copies of the charsheets and spellsheets. I have a copier in my gaming room so if the players want a copy they can run one off, or better yet, I post up their sheets intersession in pdf form so that they are available for viewing from just about anywhere.
I even take it a step further, I have created binders for each of the players, within which are:
[ ] Character sheet (double sided page from Heroforge)
[ ] Spell sheet (single piece of paper from Spellforge)
[ ] Equipment certificates (slips of paper for magic items and expendables)
[ ] Copy of the table and house rules
[ ] Copy of anything they have ever sent to me (e.g. backstory, journals, etc)
[ ] Spell cards representing their spellbook / available spells (TheOtherGameCompany.com)
[ ] Initiative Card (GameMechanics.com)
[ ] Tokens representing any animals they control (e.g. a horse)