A bit offtop, but I'm wondering if I can use Garuda Cloud to sync my stuff from Trillium Notes
I'm not familiar with trillium notes, if it supports syncing via Nextcloud or webdav I'd say yes. Have a look at it's settings and find out
Since their going to be wiping the Garuda Cloud, I would hold off till that is done and it's back open. But when/if they do reopen it you should be able to sync it again with NextzCloud since that is what the base of Garuda Cloud is.