My go-to OS disk image software is Terabyte Image for Linux/Windows. It not only is flexible, compact, but also very robust. No matter what kind of changes I made to my OS disk (change partition size, layout, alignment, BitLocker encrypted etc), a simple whole disk image restore always brings me back to a fully working Windows/Linux OS in its prime state. Acronis used to be good, but it has been having problems restoring UEFI/Secure boot disk images, with their outdated default "Restore MBR and Track 0" option in UEFI/secure boot systems. DS is flexible in that you don't need to install it and the portable tiny .exe file can run from witin Windows and PE. It's currently my secondary disk imager after Terabyte.