There is nothing that can be done to make the app work as it once did on a pre-KitKat device.
Password Safe already requests the WRITE_EXTERNAL_STORAGE permission which gives it access to any public folder on the internal storage and read permissions for any folder on external storage.
What you have to do is only attempt to save backups to the apps accessible private folders on your SD card which is locatedcan be created on your SD card at :
Please see here for more technical information: http://source.android.com/devices/tech/storage/
In summary, you are now restricted to a specific folder and can only save backups in that folder. There is now no way that any KitKat device can have unrestricted access to the entire SD card (root capable apps on rooted devices excepted of course)
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