Open another folder on your computer where you will save the SQLite backup file. Right-click inside the folder and select "Paste" to create a backup of the SQLite SMS file.

I've got it in a sub-folder, and the data source has a hard-coded path to the db file. How can I make it relative? For a WebApp, I'd rely on Server.MapPath, but how to do something similar here?

XnView uses an SQLite database for storing this info and accessing it; Windows uses a flat file for the image metadata and another for the actual image thumbnails.

SQLite supports several datatypes: NULL for empty, INTEGER and REAL for signed integers and floating point values respectively, TEXT for text strings, and BLOB for binary files.