Can we backup from Plesk 8.6 and restore to Plesk 9.0 or newer

[Lim]

hi,

Now I am consider to move all data from old server (Plesk 8.6) to newer server (Plesk 9.0 or newer). I tried to backup data from old server and upload to new server (Plesk 9.0.1) the new server not recognize the backup file. The error is

Error: pmm-ras error (Error code = 1):
== STDOUT ====================
Archiver error: unable to extract files from /tmp/phpZpL`

==============================
== STDERR ====================

==============================

Can anyone help?

Thanks in advanced.
Lim