Where is blobsaver's data stored?

It's recommended to export your saved devices to an XML file from the "File" menu. If you can't do this, then find the files here:

macOS:

~/Library/Preferences/airsquared.blobsaver.app.plist

Windows: In the registry under

HKEY_CURRENT_USER\Software\JavaSoft\Prefs

Linux:

~/.java/.userPrefs

If you're unable to find it, search for where the Java Preferences API stores preferences on your OS.