Is it possible for getting temproot or TA-backup before unlock on Xperia X(F5122) ?

I bought a Xperia X recently, and I hope to get it unlock and rooted. But it seems that unlock will erase the TA partition and lost some features permanently. So I want to know if there's a way to get temproot(such as iovyroot on z5, so I can make the partition backup).

By the way, does the backup function in the settings menu backup the application data, but not only the APKs in /data/app?

from xda-developers http://ift.tt/2c7w9DK
via IFTTT