Hi,
I'm not sure about the Gateway Imaging... That may be Gateway's feature to restore your machine to factory from the 15GB partition you mentioned...
I doubt that it will actually make an image, but maybe... What it also may do is create a set of DVD's to restore your machine to it's out of box condition...
If that is the case, it would be a very good thing to have. In a way it would be better than Acronis... just because you have been using the computer for awhile, and something might have gotten corrupted... Acronis would reload the corrupted image...
Gateway's process would be better in that example...
When I mention not selecting the entire disk when using Acronis to "RECOVER', that applies only to Recover, not creating an image "BACKUP"... You can select one or all partitions to Recover, but not the "MBR" or possibly "GPT" box...
As far as I know, this applies only to Acronis... The Windows Imaging feature doesn't have that particular check box... I don't know about stuff like Macrium...
I had never seen that option on any other methods..
Acronis uses the term Recover because you are "Recovering" an image...
It certainly get confusing when various processes intermix their terms...
When using Acronis for the purpose you are using it for, I would ignore the fact that the "FILE" stuff even exists... You can backup whichever partitions you choose, or all of them..
There is a very good possibility that if you were to save an image as "FILES", that when you later try to use it to Recover, it may not be bootable...
Backing up and Recovering PARTITIONS will boot... but that just applies to the EFI and Windows partitions... Things need to be in a specific location and order for the machine to reliably be bootable... Imaging a Partition will maintain this, File backup
and recovery may not...
You can use multiple methods to make a backup image, but you must use the program that created the image to recover\reload it... Acronis can't recover an image made by Windows for instance...
If you were to use the Windows Imaging you would need to reload\recover it either by selecting Windows Recovery in the Boot Options, or booting from Windows installation media and selecting "REPAIR" at the bottom of the window where you see the button to
"INSTALL"
If your machine will boot from a Win 8.1 DVD or Flash drive, you are all set... they are easy to get\make... It may be possible that it won't... That is where the tool called RUFUS would come into play... It CAN make a Flash that will boot..
I don't actually know how the Windows method compares to the Gateway method...
The end result may be similar, but more likely apples and oranges...
Normally the manufacturers provide a method to restore the machine to it's Out Of Box condition in some fashion...
You are correct that Restoring\Recovering an image to a 100GB partition on the external drive is a bit in conflict with Not doing this... But it would be a way to test if your backup images will work...
But it is risky, but not as risky as 3-4 bootable partitions... I don't even know if your machine will even boot to a USB HDD for sure...
My main machine is a Desktop... I can easily unhook my main HDD to test stuff without corrupting Windows... Then I have a better idea of what works and what doesn't when using my laptop or tablet... It's pretty hard, if not impossible to unhook the drive
in them..
I don't actually know what type of machine your gateway is... If I did, I forgot.
You can not make just one partition GPT or MBR... The actual DRIVE is GPT or MBR...
About my images... I keep a lot of images so that I don't need to do time consuming things over again... And I always keep my old images just in case a change I made, or a Windows Update that was installed, might cause a problem that I didn't know about
until it was too late..
I built most of my machines myself... obviously not the laptop or Tablet !!!
As a result I had to install windows from scratch... It can be an extremely long and time consuming process that I don't want to have to start over... it's much easier making and keeping the images..
In addition to that, because of the forums, I need to be able to return my machine to a previous conditions to troubleshoot other peoples problems...
I probably forgot to answer one of your questions, so remind me if I did.