The Sony SO-02C Xperia Acro mobile can be reset by software or by its own menu system. If you wish to save your mobile phone settings or data before the reset then you should backup your data onto your computer with Xperia Companion. The menu reset is the most common method however when the reset is done you cannot recover your data or settings again.
If you wish to backup your data before the reset then see the explanation on this website on how to backup your data onto your computer before you do a hard reset or factory reset. As stated the data and settings are gone once the phone has been reset.
See the instruction below for the factory reset.
Hard Reset will erase all of your data
All described operations you are doing at your own risk.
Hard Reset Sony Xperia SO-02C Xperia Acro by Menu
Note that you will need to ensure that you have made a backup of the mobile phone. Both data as well as the settings. Once the mobile phone has been reset you can then start with the factory defaults whoever you can still restore the data again if you have a backup.