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Why is my Backup data bigger than it's source
Hi, I wondering if anyone can help answer a problem I am experiencing with using Windows 7 own backup tool.
I have two 500GB hard drives in my system. Drive 0 is partitioned with 390 GB as the C: drive containing Windows 7 and user data, the remaining space is unallocated ready for me to install Ubuntu 9.10. Drive 1, as D:, is the full 465.8GB and is planned to store backups. Before my initial backup this drive was empty.
In the past I've used Acronis to backup, but my version is old and before purchasing the latest version I thought I would try Windows own backup as I have got the impression that it's pretty good.
However, backing up my C: to D: takes up more space than I expected it too.
C:
Size: 390GB
Used: 185GB
Free: 205GB
D: after initial backup (drive empty before then)
Size: 465.76GB
Used: 320.01GB
Free: 145.75GB
Is there something I doing wrong? or is there a reason why it is nearly twice the size? I chose the recommend option and let Windows decide what to backup, was that the wrong decision?
If it helps these are the three files/folders I see at the root of D:
MediaID.bin, WindowsImageBackup and LIANLI-QUAD (my computer name)