WinRAR archive question/s

[coffin filler]

Hi all

Straight to it then.

I have Winrar v 3.71 installed (new version)
The problem I have is as follows.

I have purchased QWET and the UK retail DVD is 5G in size. Obviously this causes a problem when wanting to back up my game for obvious reasons.

Normally I would make an Image and then burn to DVD but due to being 5G this is not an option.

In the past when I have wanted to back up games that are larger than 4.7G
I have made an Image and then used WinRAR to create a archive. (ie 6G game image can be lots of 1OOMB RAR files. Obviously this helps when wanting to back a game up as you can fit the correct number of 100MB rar onto a DVD until its full and then do the same again with another rar archive and so on. Then its simply put all rar files off DVD's into a folder and extract the image. Hey presto).

When I make an Image of ETQW the image is fine (I can install and run game from image made from retail DVD). I then make a archive of various rars at 100MB until the whole 5G is divided up into 100MB rars. When I attempt to extract the Image from the rars (something ive done time and time again) this time near 80% of extraction I keep getting crc error. Obviously this then renders the whole archive useless

Any suggestions on what I can do to stop this happening ?
Are there any options within winrar I can alter that may help to stop corruption of rar files ?
Will makeing a recovery record stop the corruption of rar file when extracting ? (and if so how dose one USE the recovery record?)
I have made winrar archives of many games that are over 4.7G in the past. Obviously when paying out my money I want to protect my investment by backing it up and I also have 3 boys all who use the PC so as you can guess I like to back everything up.

If anyone has a suggestion on how to make a winrar archive of a game Image (made with DT Pro) that is 5g please offer your advice.

Thanks for taking the time to read this post and hopefully offer a solution.