While playing Resonite, you might want to download your account data, be it to have a local backup of your inventory, messages and contacts or for privacy reasons (GDPR art. 20).
There are currently two ways of downloading your account data.
Resonite Account Downloader
The Resonite Account Downloader is a tool published and open-sourced on GitHub.
It offers an easy-to-use GUI to download your account data. The latest version can be found in the "releases" tab of GitHub.
AccountDump
AccountDump is a CLI tool provided in every Resonite installation inside of the game's directory, then the Tools folder (full path would usually be C:\Program Files (x86)\Steam\steamapps\common\Resonite\Tools\AccountDump).
Before running it, be sure to have .NET Runtime 8.0 installed on your computer as it is a requirement.
You can now double-click on the AccountDump.exe file in the directory to launch it.
Note that on Linux, you might need to use dotnet AccountDump.dll to run it.