How to copy system disk to ssd ?

Hi.
My OMV is installed on a 500g HD (120g system-partition, rest as data-partition for plex database)
Now I have a 128g SSD and want to use it as system-disk.
So I moved the plex database to my data-raid, deleted the filesystem and removed the partition.
The HD now has only one ext4-partition (omv-system) an 5g swap.
I made a disk-image and a partition-image with partedmagic.
Trying to restore the disk-image brings an error "targed device to small".
Restoring the partition-image works, but the system doesn't boot. It only shows "GRUB _".

So, what do I have to do to copy my system-partition to my ssd and make it boot ??????

Thx.

OK, I did it.
The sdd was used in a macbook before, so it had a gpt an no mbr.
So I deleted the gpt, created mbr, restored the partition and the system booted without any problems....