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Will "Disk backup" boot?

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I've just installed True Image 2013 (which came with my PC, dated 2013) and used it to copy my boot drive to an external USB E: drive.

The data on the boot drive occupies 77 GB according to Windows7, the backup occupies 25.5 GB on my USB E: drive. That's good compression!

When the boot drive (SSD 480GB) fails (I'm now on my fourth), I plan to buy a replacement  SSD, then recover onto it from my USB E: drive.

Will this work? 

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Swifty, in principle your plan to recover your backup of your boot SSD drive from your USB E: drive to a new SSD should work.

In practice, you may need to do a little more work here to ensure that the recovery will work and be bootable.

First, you should create and test the Acronis bootable Rescue Media to ensure that this can be booted using the same BIOS mode as used by your Windows 7 OS.  Use the msinfo32 command in Windows to display the BIOS mode being used - this should show as being either Legacy (older systems) or UEFI (newer).

If the Rescue Media is booted incorrectly then the target drive may be converted (Legacy mode to MBR / UEFI mode to GPT partitioning mode).

See KB 34287: True Image 2013 by Acronis: Creating Acronis Bootable Media and KB 59877: Acronis True Image 2017: how to distinguish between UEFI and Legacy BIOS boot modes of Acronis Bootable Media

The next check-point is to ensure that when you are booted from the rescue media, that you are able to see your internal SSD drive along with your external backup drive without requiring any additional device drivers to do so.