the existing image \fIIMAGE\fR in \fIWIMFILE\fR, but captured at a later point
in time, possibly with some modifications in the intervening time. This is
designed to be used in incremental backups of the same filesystem or directory
tree. \fIIMAGE\fR can be a 1-based index or name of an existing image in
\fIWIMFILE\fR. It can also be a negative integer to index backwards into the
the existing image \fIIMAGE\fR in \fIWIMFILE\fR, but captured at a later point
in time, possibly with some modifications in the intervening time. This is
designed to be used in incremental backups of the same filesystem or directory
tree. \fIIMAGE\fR can be a 1-based index or name of an existing image in
\fIWIMFILE\fR. It can also be a negative integer to index backwards into the