The easiest way to prevent your disk from getting too full is to schedule regular cleanups of recordings and backups older than x days.
Create a file /etc/cron.daily/cleanup (for example) and add the following to it:
#!/bin/sh
/bin/find /var/spool/asterisk/monitor/* -daystart -mtime +30 -delete >/dev/null 2>&1
/bin/find /var/spool/asterisk/monitor/* -type d -empty -delete >/dev/null 2>&1
/bin/find /var/spool/asterisk/backup/* -daystart -mtime +30 -delete >/dev/null 2>&1
After creating the file make it executable.
chmod +x /etc/cron.daily/cleanup
This will run every day around 12-5am and delete anything older than 30 days or whatever number of days you end up using. It also works on subdirectories and files in those directories.
File Compression
If most disk usage is due to recording you can enable compression. This will greatly reduce files size at the expense of increased CPU usage.
If using Freepbx GUI go to Settings>Advanced Settings
Near the bottom change Call Recording Format from wav to gsm
If using Freepbx GUI go to Settings>Advanced Settings
Near the bottom change Call Recording Format from wav to gsm
