factory reset

[Tasneem11]

How do i backup all my data before factory reset?

[Thommo]

If it turns on then connect to a pc etc and use Pc Companion or another app of your choice and for contacts I prefer to create a .vcf file by opening contacts then options then Export to internal storage then saving the .vcf file to my Pc

[Uliwooly]

There are multiple alternatives

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355