How to restore a e2image image backup

Question

I’ve created a image from my partition with the e2image tool like this:

e2image -rap /dev/sdb2 /backup/sdb2.e2image

The Partitions size is around 870GB, but it used only around 25GB. When I do a ls -laht to check it size, I get this:

-rw-------  1 root root 868G 31. Mär 10:36 sdb2.e2image

Then I check the size with du

25G /backup/sdb2.e2image

now I created a lvm:

LV        VG      Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert                                                    
arch_root vg_arch -wi-a-----  30.00g

Now i want to restore my old partition backup, to this lv, so I do:

e2image -rap /backup/sdb2.e2image /dev/mapper/vg_arch_root

But i always get an error during the restoring process:

e2image  no space left

What i'm doing wrong?