What's adequate can vary greatly from site to site, but if you find a hosting provider that can add space when you need it, you should be fine.
Ihe zuru ezu nwere ike ịdịgasị iche iche site n'otu saịtị gaa na saịtị, mana ọ bụrụ na ịchọta onye na-eweta ọrụ nchịkọta nwere ike itinye ohere mgbe ịchọrọ ya, ị kwesịrị ịdị mma.