File System Size for COPAC

Hello Experts,

Do we have any formula to calculate the size of file system in advance which is required to keep the archive files in file system.

As we all know, COPAC takes a lots of space in file system. Hence I want to keep things ready before we start the archiving.

Please help.

My CE4XXXX Table + Index has around 1.2 TB size.

Thanks

Rahul