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What sort of back-up is needed to enable a system restore? Why is back-up smaller than drives?

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Hi

I wonder if anyone can confirm that I've set my back-up correctly.

I want a back-up that enables me to restore my entire pc (programs & data) to another pc in the event that my pc dies. My current PC has a Program Disk- C - (85gb) and a Data disk - D - (135gb).

To set the back-up I've chosen Disk & Partition Back-up and ticked the boxes beside the System Reserved, Disk C and Disk D., switched to disc mode and ticked Disks C and D.  It tells me the expected size of the back up is 130gb but my two disks have 220gb of information on them - what have I missed?

The back-up file is going to be saved to an external hard drive.

Under my Disk Back Up options, I've chosen the Incremental Scheme.

On the Advanced tab do I need to tick Back up Sector by Sector?

Is there anything else I should or shouldn't be doing?

Thank you

(edited after reading Grover notes)

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pagallery,

My suggetsion would be to make a couple of changes.
1. Sector by sector not needed for normal systems which use Windows.

2. When selecting what is to be included within the backup, click the DISK MODE option rather than clicking each individual partition. This is illustrated as the beginning picture inside my guide located at signature link #2 below. Choosing the disk mode versus selecting each partition individually enables you to choose the disk option as the restore method without being forced to choose and assign each partition individually. Simply said, the disk image or disk mode backup makes for an easier and safer method of restore.

3. Before you decide to use the Incremtnal method, review this link.
http://forum.acronis.com/forum/38799#comment-122496

If you use the Incremental or Differeential scheme, Use either as part of a custom backup scheme. This will enable you to choose how many backup chains you want retained and the backup deletions will be automtic by the program and it wil save you time by not doing manual deletions and the subsequent problems often resulting from a user mistake. Again refer to link 2 below and look at the examples listed as 11-INC or 11-DIF

4. If you need to make chngess in your backup task, it would be much much better to start with a new task as task editing does not always produce the results you might expect.

5. A complete review of the #2 link and a glance over of link #3 may be of interest..

You can expect the backup size to be about 70-75% of used space if normal compression used.