wimlib

Thank you for the explanation.

Does --delta-from not depend on the mod timestamp like update-of?

And I still haven't figured out what the real difference between delta-of und update-of is, except that update-of needs an IMAGE and Dealta just the wim file...

I made a test run with wimlib-1.12.0-windows-x86_64 (Win10 Pro 15063) and got this error:

[ERROR] A file was concurrently modified!9%) done
Path: "\??\GLOBALROOT\Device\HarddiskVolumeShadowCopy11\ProgramData\Acronis\BackupAndRecovery\MMSData\DML\F4CEEE47-042C-4828-95A0-DE44EC267A28.db3-shm ...