filling up disc space ?...

[TERIIHUB]

Hi, I am running fsarchiver to copy files to another SSD on the network using -j or not.
I have the feeling that doing succesfull copies to this other network PC drive also fills up my own disk fills up until it gets block.
My copy to the network ssd uses nfs protocol.

Do you know of any parameter I could use in CLI copy line in order to free up room on disk after each copy process ?
Else, what is the local folder's name ...Fsarchiver also uses in order to store temporary files while copying the data to anohter PC that I could empty after each process. ?
sudo fsarchiver -j4 savedir /mnt/dataserv/backsource.fsa /media/mypc/SOURCEFOLDER

Thanks,
Looking for to uses fsarchiver for a longer time...
Terii