Questions on capabilities and requirements

Hi,
I'm planning out a 3-4 person mail/webmail/collaborative service server for a sales office at a remote location.
The network hardware items I have a good grip on but the Mac server environment I have a few questions for:
1. I have found a thread or two... and I have read in a few spots that mail redundancy is not possible without the use of Xsan's. I assume this is correct, but what is the minimum hardware requirements for (for example) 2 mail server (primary/backup) and mail store server (3 total). (I have a concern on cost of this capability)
2. Time Machine backup. I have read that in OS X Server, TM fails to backup everything, but will cover all user related data (mail, home folders, iCal, CardDAV, etc.) What does TM fail to backup? (I could not find a clear answer for this) (Referring me to a thread for this is OK!)
3. In terms of Remote admin. Are there any limitations to remote admin, besides not being there physically for physical troubleshooting? And... this absolutely requires the remote admin to have a Mac (any Mac will suffice, Ipads, Iphones?)
4. When configuring users in OD, I'm assuming its possible to chose whether or not a certain users "home" will be located on the server or kept on the user's own machine. Correct?
5. I read in the server manuals that ICal and CardDAV setup asks admins to set the max size of storage. ICal also asks about max size of individual entries... I'm not familiar with how big ICal entries can be? Can anyone elaborate on what a user can enter into any single entry in ICal?
6. Relating to #1, if I decide to stick with only one mail server. Though I could probably recover from a disk failure (with a bootable image)... Would it be wise to have a second server to join the network and serve as a backup vs. let users hang without mail / along with waiting for a new server to arrive?
This would assume I can remote to the 2nd Server and setup the mail service on that and bring over the mail store from backups.
Thank you!!

Mail services don't require an XSAN. You should have a primary and a secondary mail server - 2 minis would be fine. Of course, you'll need to fix the primary in a hurry if it goes down.
Time Machine is not going to properly backup a server. IIRC, mail services are one of the reasons not to use TM on a server.
There is VNC software to remote into a Mac from a PC. Not sure about iPads and iPhones.
I haven't used calendar services on an OS X Server, so I have nothing there to offer.
If email is a valuable service, you shouldn't rely on one server.
http://swishmail.com/emailhosting1.php
offers a lot of email service for $20 per month. There are other companies offering the same services. I'm not sure of your comfort level with email servers, but if you're new to it, there's a lot to learn, and a lot of mistakes you can make.
Google calendar may be worth looking into, and they do email hosting with your own domain if you'd like.

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