I have the Windows seven Ultimate 64 bit  version installed in my Dell Vostro laptop and the back up in it has a serious problem. The problem is, when I try to run back up of my computer then it prompts as low space for back up when I have more than 65 Gig Bytes of free storage in each drive. I have tried reinstalling the windows and disk cleaning but the problem is not eradicated. Please help me with this problem.
Back up problem in Windows 7 Ultimate 64 bit
If you are trying to back up your Windows 7 to the backup drive, you need to make sure that is if formatted in NTFS and not FAT or FAT-32. FAT-32 file systems will only allow you to save files smaller than 4GB, even if you have 500GB of free space. NTFS files systems do not have these limitations, and therefore it is recommended to make sure you backup drive is formatted in this file system. To do that, follow the steps below:
Note that when you format this backup drive, all the data that is on it will be removed.
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Open Windows Explorer.
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Right-click on the External / Backup Hard Drive (this is the drive where you will save your System Image on).
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From the window that opens up, click on Format.
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Look for File System and click the down arrow to select NTFS.
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Click the Start button.
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After the format has complete, you will now be able to save files larger than 4GB on the backup drive.
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Back up problem in Windows 7 Ultimate 64 bit
Happy to support you!
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First of all, it might be that your hard disk is fragmented too much and thus it doesn't allow the back up. So, defragment the hard disk.
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If this brings no solution, it may be that the "system reserved partition"needs more shadow storage space. Therefore, check whether it has enough free size, not less than 50 Mb.​​
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Right click on computer > manage > disk management.
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If the system reserved partition doesn't have around 75% free space, then right click on it > choose usage drive letter & path > assign it a new drive.
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Then try the back up again.