Oracle offers the ability to specify so called ‘alternative’ archive log destinations in case the primary archive log destination gets full. You can enable this feature by setting:
log_archive_dest_1='location=+FRA REOPEN=0 MANDATORY alternate=log_archive_dest_2' log_archive_dest_2='location=/some_path MANDATORY' log_archive_dest_state_1=ENABLE log_archive_dest_state_2=ALTERNATE
A configuration often used involved using the flash recovery area as primary destination and a nfs destination as alternative archive log destination.