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How to setup W7/W10 Dual Boot-PC for Image Backup with Bootable Acronis-media?

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I will install Win10 and Win7 on a new PC for a relative and need some advice on how to proceed so that in the future image backups of both OS-partitions can be made seperately with the Boot-DVD from Acronis True Image 2019 (not on-line). She further has Acronis Disk 12 (not the latest 12.5).
 
The reason dual boot needed, is that the many games that do not run on Win10 are still required. But all other work is done in Win10. The reason for the use of the Bootable Acronis DVD is that this is easier to manage for her as she is used to that from her old laptop with Win8.1.
 
The new PC is ready next week, so I have some time to read into the subject. It will have a 2TB HDD (no SSD), and I will do the complete installation of Win10, Win7 and all application software. The HDD will have the partitions for the OS's (I know that for Win10 the image backup will comprise multiple partitions) and 1 DATA partition. The Data-patition will also hold the image backups.
 
I just do not want to start installing Win10 and Win7 and then find out that for Acronis True Image to be usable, I should have done something differently (Partitioning, formatting LPT or not, seperate Boot Manager or the one from Microsoft, or whatever). I have some general knowledge about this subject. And a computer shop I went to advised me not to use Acronis but either take a free alternative or another one. But again, that is not what she (and I) want: making images should remain the same for her as she did before.
 
I cannot imagine I am the first to want to do this. I have searched the internet and this forum, but cannot find this specific topic: that is seperate image backups of a dual boot PC with bootable Acronis media. And I do not want to have to change the way image backups are made.
 
Please help me how to do this. Thanks in advance for any help.
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welcome to these public User Forums.

Some general recommendations here.

  1. Make sure that Windows 7 supports all the new hardware in your new PC, or that you can obtain drivers for any that doesn't have native support in the OS.
  2. Install Windows 7 first, then install Windows 10 later.
  3. Both Windows 7 & 10 should ideally be the same architecture, i.e. both 64-bit.
  4. Both OS should use the same disk partition scheme, i.e. UEFI/GPT for both, or else Legacy/MBR for both.

Not sure why you would be wanting to make backups using the Acronis rescue DVD for this dual-boot scenario?

Personally, I would install ATI 2019 in both Windows 7 and 10 - this will still count as being installed only once because it is to the same physical hardware by signature, so only one license is being used / needed.

You can make backups from within either Windows OS of one or both of the OS partitions, along with all other hidden / system partitions, and can use the scheduling feature of ATI for this.

In the event of recovery of either OS, then provided you can boot to the second OS, you can recover just the one OS partition from within that second Windows OS running ATI.

Note: I have a laptop which was originally running Windows Vista with Windows 7, then upgraded to be Windows 7 with Windows 10, and currently running Windows 10 Home / Windows 10 Pro plus Xubuntu 18.04.2.  Being able to recover an OS partition from the second copy of Windows has been a life saver at times!

Thank you very much for your friendly welcome and swift response, Steve.
You asked "Not sure why you would be wanting to make backups using the Acronis rescue DVD for this dual-boot scenario?".
That is because for her former work, she was required to use Acronis' off-line backup utility for the laptops they used. This was deemed to be fool-proof as no interference whatsoever could happen because theOS was not active. She learned how to make an image backup and how to backup related critical data in that manner. And after that she went on the same way buying the latest versions of Acronis True Image and Disk Director. And to be honest, I do not want to change an easy method that works - that is easier for me too.
For this new PC, all work-related stuff is done under Win10. But she has a lot of (large) games that only run under Win7. That partition may occasionally need a backup: only if a new addition is added. But the Win10 environment needs frequent image backuping, and so does her data.
 
From your recommendations I understand that:
1.   on the 2TB HDD I first create a new partition (the rest "unallocated"), format it as GPT and do a Clean Install of Windows 7 in that partition with all correct Win7 drivers;
2.   next, on the 2TB HDD I create a new partition (the rest "unallocated"), format it as GPT and do a Clean Install of Windows 10 with all correct Win10 drivers in that partition (which will result a Windows partition on that selected partition plus a few extra partitons like MSR and System);
3.   next, I format the remaining unallocated disk space as GPT partition for User data.
 
 
If I understand correctly, after this:
4.   she can select which OS to boot in using the standard Microsoft Boot Manager (no need for fancy 3rd party software);
5.   she can make an image backup of Win7 (that partition) and of Win10 (those 4 partitions) and data can be backupped as usual from the Data partition.
 
If this is it, then this is as easy as can be.
 
Thanks very much.
When the new PC is assembled and I have it next week, I will let you know how it all went!

GPT is the UEFI partition scheme for the whole 2TB drive, within which you will be creating separate NTFS partitions for each of the installed Windows OS.

When you install the first OS to the empty drive, it should create the hidden / system EFI & MSR partitions, whereas if you install to a already formatted drive, it may store all the EFI / Boot data within the OS partition so that there will be no separate EFI & MSR partitions.  The downside of the latter is that the second OS will be tied to the first OS partition as its BCD data etc will be stored in that first OS partition.

The method used to boot the Windows install media will dictate which partition scheme (GPT or MBR) will be used - if you boot the install media in UEFI mode then GPT will be used.

This also applies to when booting from the Acronis Rescue Media (for backups or recovery) where the BIOS boot mode should match how Windows boots.

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

Thanks for the additional explanation, Steve.

Your reply made me realize that I had a bit wrong idea about the relation between the GPT partition scheme and creating a partition. Your latest response pointed that out, and now I have searched the internet some more, I fully understand it.

I will install directly onto an empty drive, first Win7 and then Win10.

And booting in the same (UEFI) boot mode from Acronis then works fine to create an image for each of the 2 OS partition sets. And the same for subsequent restores.