Inmarsat C message deleting

Ran into a an issue where the memory is full on this inmarsat C machine? I want to format the disc to clear space but I can’t find the rules on whether or not it’s OK to delete the old messages that are stored.
Thanks in advance

You can delete them, save relevant notices on paper if required, I format one machine at a time so the other has the messages, stagger them.

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Thank you bud.