Mailbox and public folder backup frequency

Question

I appreciate this is very much organisation specific, but out of interest;
1) how often do you do full backups of your mailbox databases..
2) how often do you do incremental backups of your mailbox database(s)..
3) how often do you do full backups of your public folder database(s)..
4) how often do you do incremetial backups of your public folder database(s)..

Answer 1

You are right - this is going to depend highly on your organization - and more about how much redundancy is built into your system than anything else.  I have built Exchange solutions for many corporations (5000 to 200,000+ desktops) and have seen everything
from "we will backup daily and delete the backups the next day" (a legal firm who wanted no historic data kept in their system) to "we will backup every day and save two weeks, and save a weekly backup for six months and save a monthly backup for six years"
(can't remember who did that one).  My previous employer (20,000 seats) had Exchange 2010, and have about 100 databases (200GB limit) with three copies of each database (two local for HA, one elsewhere for DR), and did daily backups that were
kept for a week.  My current employer (13,000 seats) has Exchange 2010 with 24 databases (2TB limit) with four database copies (three local for HA, one in another datacenter for DR, and two DAGs that mirror each other, so both datacenters host
active mailboxes), and we have no backups.
Oh, and for both of my recent employers, we have no public folders.  Just another thing to break down that we don't need to worry about.  (-: