Does the current version work with 1.21.4 or do we need an update? :)

1.21.3 and 1.21.4 seem to need explicit support, at least on fabric. Specifically, they work on server fine but crash the client when trying to render toasts.
I'll be doing my normal steps of testing each modloader / subversion combination to get everything working, but I do have a few other things that need to be done first unfortunately.

https://github.com/HeatherComputer/AdvancedBackups/actions/runs/12491600755

One of the outputs here is a jar for 1.21.2 - 1.21.4 fabric. It has been tested on all.

This issue has been closed - fixed in 3.6.5 which has now been pushed to Curseforge and Modrinth.