http://gothub.r4focoma7gu2zdwwcjjad47ysxt634lg73sxmdbkdozanwqslho5ohyd.onion/mtkennerly/ludusavi
Features Ability to back up data from more than 19,000 games plus your own custom entries. Backup and restore for Steam, GOG, Epic, Heroic, Lutris, and other game libraries. Both a graphical interface and command line interface for scripting.
Tab completion is available for Bash, Fish, Zsh, PowerShell, and Elvish.