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HELP - Disc Clone and Back-up?

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Having just installed Acronis and then installed a new 1TB hard drive for use as a back-up disc I Cloned the Hard Drive containing Win7 after doing this I decided to do a full back-up and to my horror I have noted that the 1TB disc now has over 750GB of spce used up - twice that of the Win7 HD.

So I must have done something wrong: - Did I need to do a full back-up after I had done the 'Disc Clone' operation?

If so what do I need to delete or should I clean the back-up HD and start all over again?

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Why did you clone. You shouldn't clone a system disk to another disk unless you keep the 2nd disk removed during boot up. You should just make a backup.

If you're sure your original disk is okay, then I'd do a quick format of the second disk to remove all files. Then make a full diskmode backup of the first disk to a location of your creation and choice on the second disk.

Windows won't allow two system disks being connected at boot up and will mark one of them as not a system disk and then it will no longer be bootable -- if you're lucky it won't mark you C: drive this way . Besides clinging only lets you make one copy of your disk while making a backup lets you make as many backups as you can fit on the target.

Wow that was quick - and thank you.

Why did I 'Clone' well I thought that would be the start point and I needed to do that before backing up the whole disc. It has not changed my Win7 Pro HD as that one is not the boot disc. In fact I have two 'main' HD's on my PC the one which is the boot disc has XP 32bit on it - soon to be upgraded to Win7 32bit Ultimate and the other HD is the one containing Win7 Pro 64bit. I have two other HD's which are at present used for backups, one being the new 1TB

I wont bore you with the whys and wherefores as to the reason for the above but suffice to say the 32bit system is used by my daughter.

Anyway I am grateful for your advice and will action soonest.