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If you are updating from a older to a newer version of the modpack then you should be fine. Add some more details and ill be able to help you some more!
I presume you had MCPC installed on your old install so just put that on there, restart the server and your plug in folder should appear. Then copy your plugins folder and all your world folders to the new install and your done!
Your going to want to delete the FTB.jar (or whatever it may be called) in the main directory of your server. Then you will want to download MCPC for 1.4.7 (google it) and place it in the main directory then rename it to 'server.jar'. Following that you will want to make a start.bat script with the following in it:
Now you will want to double click the start.bat and it will generate the plugins folder, simply place all your plugins into it and restart the server and you are done! Google 'Installing MCPC for FTB' or similar for more info.