Can anyone explain the detailed steps for doing a Backup of Call Manager..
Here is link which talks about backup
BARS is supported backup software for callmanager
Can u let me know if there willbe a downtime required for Backup.
Also where do i see that the Records are growing in Size
If you are talking about BARS backup ...there need not be any downtime as you schedule it during off production hours like 1 am in night (since it causes cpu spike )
here is link which will answer some of your questions