Apple Mac File Server

hi Mac experts:

1.  have 3 iMacs,  1 for web developing,  1 for graphics design, 1 for the combination of the 2.
2.  using external hard drive for sharing.  a total of 6 2tb.  3 for timemachine backups of 3 iMac
and the other 3 are from retired or old files, projects.
3. peer to peer now with one hard drive sharing to 3.
4.  one iMac is running  iOS 10.6, and the other 10.8.4, & 10.9.1


what is the best solutions for the followings:
1. stored all websites on the server for development, using dreamweaver cs4; 2 imac need to do the testing b4 uploading to the host.
2. remotely can login for work at home
3. online backup for the server
4. online backup for each iMac
5. using photoshop, illustrator for design now.

also,
the imac running 10.6 is very slow.  what is a good mac utility that you have good experience with.  2.4ghz, intel core 2 duo 4gb 667mhz. (max memory)

thanks so very much in advance.
goodfinderAsked:
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serialbandConnect With a Mentor Commented:
Any of your existing iMacs can already run as a server.  You could just enable Remote Login and port forward ssh externally, so that you can connect from home.  You can set up a poor man's VPN with ssh.  Dreamweaver can update over SSH.  You could use Apple Remote Desktop too if you enable Remote Management.

Here are some basic tips to help speed up your mac a little.
http://www.macworld.co.uk/news/mac/mac-too-slow-tips-speed-apple-mac-computer-3490637/
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Peter LoobuyckConnect With a Mentor Commented:
1. Use the slowest machine as a web server
2. Get a firewall that supports VPN, and USD VPN
3. Crashplan for sure
4. Dito
5. Adobe nerds a powerful Mac, the mavericks machine perhaps?
6. Consider an Ssd as boot device
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goodfinderAuthor Commented:
Thks.  

What is a good utility to speed up the imac.... below question 5  

Thks again.
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goodfinderAuthor Commented:
Also is the miniac a good solution for being a server?
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goodfinderAuthor Commented:
Mini mac. I meant.
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Peter LoobuyckCommented:
To me, a mini is the perfect solution
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