Can you verify that you're using TBWinPE/RE Builder to create the TBWinRE build? You didn't say if, when you recreated the build, what Builder showed for the license was correct. Is this step of the wizard turned off? There is an option in Settings, General tab, "Skip license step if license format appears valid" -- is it unchecked? For the Builder build, the license is copied from TBWinPE.ini (Name-V3, Key-V3). For the script build, the license is copied from the LicenseV3.ini file.
Can you try a default build? Download the tbwinre.zip file and extract it to a new folder (e.g. C:\TBWinRE). Then run TBWinPE.exe and create the TBWinRE build. Check the license details and don't change any options.http://www.terabyteunlimited.com/downlo ... bwinre.zip
If BitLocker isn't currently turned on (no encryption on the system) then it shouldn't be getting in the way on the lock. In my experience, using the aggressive lock in this type of scenario does cause any issues -- it's not like a running system. Does the issue go away if you wait a few minutes before trying to start the backup?
That being said, you stated that the backup you tried to do before was coming out very large. This seems to indicate that BitLocker may be enabled. Can you verify it one way or the other? When you're selecting partitions to back up in IFW, does it show "Bitlocker" on any of them? In Windows, does File Explorer show the "lock" icon on the Windows (C:) drive?
A screenshot of what Disk Management shows and one of what IFW shows might be helpful.
a. If BitLocker isn't used, then just take a normal backup of the entire disk. This can be from TBWinRE or from Windows. If BitLocker is used, then you would want to use VSS in Windows or the "Read from Volume" option in TBWinRE.
b. If BitLocker isn't used, you can resize the partition with BIBM or you can shrink it using Disk Management in Windows. If BitLocker is used then you would want to do this in Windows (don't use BIBM).
c. This would just be another full disk backup created at that point -- same as "a".