tar

remote tar

#get
$ ssh user@host "tar zcf - /var/lib/mysql" > file.tar.gz

#send
$ tar zcf - /var/lib/mysql | ssh user@host "cat > file.tar.gz"

Собрать tar архив из part*

$ mkdir /path/to/newfolder
$ for i in *.tar.part*; do files="$files $(readlink -f $i)"; done
$ cd /path/to/newfolder
$ for i in $files; do tar -xvf $i; done