GB difference Live vs Recovery = Why?

[bjm_]

After 5.2 install. Boot Menu & Emergency Disk re-create...then tested Boot Menu & Emergency Disk...then ran Full System Backup.
Does GB difference make sense?
Full from recovery enviornment - 68 GB - 07:22 minutes - Low compression
Full from live machine - 35 GB - 02:45 minutes - Med compression.


re-test:
Test 1 = Med comp - Full from live = 35 GB

Test 2 = Med comp - Full from recovery = 69 GB

Note: Test 2 does not appear with Logs?

If the Windows partition (C: drive) is BitLocker encrypted, the image file generated in WinPE will be larger because BitLocker may not be unlocked in WinPE, in which case the program performs a "Sector by sector backup", which means that all sectors will be backed up.

Ahh...When image file is generated in WinPE and BitLocker is not unlocked in WinPE.  Haselo performs a "Sector by sector backup"...all sectors will be backed up...creating the 34 GB larger image.   

Does WinPE image have any compression?   
Does WinPE image size essentially equal the size of the disk being imaged? 

I'm just now grasping what a "Sector by Sector" image is/does.  
I imagine if my disk is healthy.  I don't need to regualry create "Sector by Sector" images.  
I'm now wondering whether I should incorporate  "Sector by Sector" images in my backup routine.  

I've only restored from Live machine images.  
Will/May my restore experience feel different = WinPE vs Live image...Restore?

May I restore a "Sector by Sector" image generated in WinPE from Live machine?

Thanks
Regards w Respect