Advice needed for backup strategy for office

My office is switching from PC to Mac (yay!) and I'm in charge of setting up the system. We'll be using 4 iMacs and a Mac Mini Server with ethernet connections. I'd like to ask what is recommended for backing up these computers.
My thought would be to back up the iMacs separately from the server - is this definitely the way to go?
I'm thinking to get a 3TB Time Capsule for the 4 iMacs so that Time Capsule will do automatic backups.
- Is it OK to have 4 iMacs backup to one Time Capsule like this?
As for the Mac Mini server, I'm not sure how to best back it up.
Since it has two 1TB drives, I'm thinking of using one drive for data and having it automatically backup to the other internal drive. Any thoughts on this idea?
Or, it is possible to connect an external USB drive to the Time Capsule's USB port, and have Time Machine backup the server to the external drive?
Any advice is greatly appreciated!

The TC is really a home solution.
For business I think you should consider something extra.
Although 4 computers and a server is not a big setup, it is worthwhile doing a more professional backup and use something more professional than Time Machine.
For instance..
http://www.retrospect.com/au/products/mac
I have not used it.. but I see it recommended in business / larger installs. It is not cheap but well worth considering.
I would not use the internal disk of the server for backup.
As for the Mac Mini server, I'm not sure how to best back it up.
Since it has two 1TB drives, I'm thinking of using one drive for data and having it automatically backup to the other internal drive. Any thoughts on this idea?
You can raid the two disks if you don't need the capacity.
But backup to a USB drive plugged in.. USB3 drives are cheap and speedy. Much more reliable than using network drives.
Raid for integrity of working data.. backup to separate change over disks.
So weekly you change over the USB drive for backup and store the other one at home.
I'm thinking to get a 3TB Time Capsule for the 4 iMacs so that Time Capsule will do automatic backups.
- Is it OK to have 4 iMacs backup to one Time Capsule like this?
You can do this.. It is fine to have 4 Macs backup to it. But if you are not using the wireless router it is a waste.. you can just backup over network to the server.. TM works fine on network.
You can buy another 3TB USB drive for backup of the clients.. normally though you want all the working data on the server and back that up. You are thinking a more peer to peer model.. once you introduce the server you can work on a more server client model where the current files are held on the server.

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Rachel Taylor wrote:
I want to have regular backups so time machine looks great but do I really need to have a bootable copy of my system?
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Rachel Taylor wrote:
A separate drive would give me more flexibility but is the quality going to be as good as the server quality drive in time capsule?
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Rachel Taylor wrote:
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