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Imaging dual boot system

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I have a dual boot system (Windows 10 and Ubuntu 19.04) on my Lenovo laptop.

Simple question (with probably a very simple answer to it). Should i image while I am in Windows or use the recovery media and image from there.

If I image from recovery media it is VERY quick (using a portable 1gig SSD drive), it is slower in Windows.

I have not had to test the recovery process, I just want the most reliable method.

Nik

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Nik, either backup method should be fine and each has its own benefits. 

Personally, I have used both for my dual boot system (Win 10 with Ubuntu 18.04 LTS) and tend to default to backing up from Windows for ease & simplicity. 

I have also recovered the Linux partitions from Windows too when needed. 

Having proven Acronis rescue boot media is always recommended for the worse case scenario of a total disk drive failure. 

Ditto to Steve.

As far as recovery goes, I would say the most reliable is rescue media.  If you ever need to recover the OS partition, you would have to reboot the system anyway, and then it will try to launch a temporary Linux version of Acronis rescue media.  This is not the most reliable method and can actually cause boot issues with your local system if it modifies the bootloader this way and is interrupted because of things like secure boot, or using bitlocker, or general bios firmware limitations.

The rescue media is my go-to for system recovery.  Just make sure that you have good rescue media (make sure it is bootable, make sure once booted, it can detect your source and destination drive).  For the best compatibility, building the rescue media using the WinRE or the WinPE (ADK) method with current Windows 10 ADK is ideal so that you get native PCIe NVME driver support and Intel RAID support.  And if you have custom hardware, you can add your drivers into the rescue media at build time too.  

Plus, if your OS can't boot... rescue media is your only real option then too.