FYI, the dev of Backloggery is working on a revamp of the site. It's coming along and looking quite nice based on what he's shared. It should be noted that Covid set him back a bit, and he codes using his voice (can't use his hands due to disability), so it's a slow burn.
I still use the site, and I am really looking forward to the new version of the site (which will retain your current data, as well as add new features).