Your users can export data from their self service portal logins upto a specified limit as per their purchased plan, i.e. Continuity users can export upto a year, Tracer users can export upto a year, Durability users can export upto a year and from the HOLD account you can export upto a year. Any export done beyond the limits is charged at per GB, billed in a monthly invoice in arrears to cover the extra export in that month.
E.g. One DURABILITY user exports 30 GB in a year, there is no extra charge
One DURABILITY user exports 50 GB in a year, are not charged and 5 GB are charged at per GB via a bill generated at the end of the month.