Hello xeonz,
You can;
- increase the size at which AS splits off the log files, to reduce the amount of files generated
- set up a rotation job in your operating system's log daemon to archive/delete older logs
- set AS to log to syslog, and rely on the usually already present log rotation of syslog
- set AS to log to syslog, and forward that to another logging solution, where you can there deal with it
This page contains all the relevant information:
https://openvpn.net/vpn-server-resources/logging-and-debug-flag-options-for-access-server/
Kind regards,
Johan