Absolutely! You can always export your data from Base - anytime you wish, as many times as you want. Exporting will give you your Leads, Contacts, Deals, Notes and Tasks. Keep in mind that activity history, appointments, documents, emails or call logs cannot be exported.
To export your data, follow these steps:
Et Voilà! You now get a mail with a link to download all your contacts in a nicely crafted CSV file.