Maximum con current recording

Dear All,

I have 400 extensions. And the conversation of each extension has to be recorded. So, I want know how many concurrent recording does Asterisk 1.6 support given that I have 3.0+ Ghz quad core CPUs, minimum 8 GB RAM and HDD space is not the issue.

Also, I want to backup the voice files (.gsm or .wav) of those conversation in a separate disk (external), so that when I need that, I can restore them and play. I found that freepbx’s backup and restore module backups cdr but that is only the sql not the recorded voice files.

Please suggest me.