Auditing Remotely

For those of you that have credit unions outside of your city, especially for those that have them in another state.  How do you conduct you audits of those offices?  Do you go on-site, hire an external firm from that city to conduct the audit, or audit 100% remotely?  If auditing remotely, can you share how that is done?  How are the cash counts done?  How often are these branches audited (once a year, once every two years)?

Any input would be greatly appreciated!

Thank you