probably want \fB--solid-compress\fR instead.
.IP ""
Be careful if you choose LZMS compression. It is not compatible with wimlib
-before v1.6.0, WIMGAPI before Windows 8, DISM before Windows 8.1, and 7-Zip.
+before v1.6.0, WIMGAPI before Windows 8, DISM before Windows 8.1, and 7-Zip
+before v15.12.
.IP ""
Also note that choosing LZMS compression does not automatically imply solid-mode
compression, as it does with DISM. Use \fB--solid\fR if you want to create a
.TP
\fB--unsafe-compact\fR
See the documentation for this option in \fBwimlib-imagex-optimize\fR (1).
+.TP
+\fB--snapshot\fR
+EXPERIMENTAL: create a temporary filesystem snapshot of the source directory and
+capture the files from it. Currently, this option is only supported on Windows
+(Vista and later), where it uses the Volume Shadow Copy Service (VSS). Using
+this option, you can create a consistent backup of the system volume of a
+running Windows system without running into problems with locked files. For the
+VSS snapshot to be successfully created, \fBwimlib-imagex\fR must be run as an
+Administrator, and it cannot be run in WoW64 mode (i.e. if Windows is 64-bit,
+then \fBwimlib-imagex\fR must be 64-bit as well).
.SH NOTES
\fBwimlib-imagex append\fR does not support appending an image to a split WIM.
.PP