[ViNT]

Lib_resloader hasn't functions for saving data, it only can load data from resources.

If you need to save data to the phone's file system, you should use Lib_jsr75. Note, that using this library you may get a lot of troubles with different filesystems, security settings, etc.
If you need use saved data only in your midlet, it will be better to use RecordStore, that allow you easily save your data to the system registry independently of phone model and security policy. To get information about RecordStore, refer to standard MP help.