All of your database information is stored in the Alexandria Support folder, located in your operating system's shared application directory. Your data folder is in a subdirectory that matches your database serial number. This is where you'll find the Alexandria database (ALX.db); various operation files, such as reports, exports, etc.; log files, version history, and more.
On Windows machines, the shared application folder is typically located here:
Local Disk (C:) > Program Files (x86) > Alexandria Support
On Macintosh machines, this folder is typically located here:
Hard Drive \ Users \ Shared \ Library \ Application Support \ Alexandria Support