The good point of Logseq is that is stores everything you write in markdown directly into your hard disk. This means that if you have some kind of backup (at least) of the folder(s) you leave your work in, you should be fine.
I use Logseq as a “writing machine” on steroids, meaning that all my original research material(s) (i.e. books, papers, data and so on) is also in other folders in my hard disk.
Should Logseq “eat” my files or part of them, I would “only” loose my editorial work and not every single source I collected.
Hope I got the point