How I can export all my Account and Contact records?

How I can export all my Account and Contact records?

Please, I need your help.
How I can export all Account and Contact records? I have over 7000 records in each of them and I need to keep current a separate application that always uses this data.
Need to get the time I needed, a file for accounts with all the records that I have and likewise another file for Contacts.

Thanks.

Quito - Ecuador