Comment 2 for bug 205656

partimage-ng now supports multiple files.
actually it always did:

partimage-ng save /dev/sdb1 stdout | gzip | split -d --bytes=650M - image.

this will create image files of 650MB, starting with names image.00 image.01, ...

to restore, use:

cat image.* | gunzip | partimage-ng restore stdin /dev/sdb1