Adguard has a clumsy text-based block&unblock method, so it's tedious to do. And given that we all have several devices, I'd have to (un)block a lot. Which is why Pihole seems more useful at the moment.
How do you host Obsidian? Last time I checked, it only ran as a local install, so the "hosted" version was just a virtual machine running a local copy. Is it still that?
And don't think that you can just back up using a file-copy process. These things have databases that also need to be backed up. It's not as simple as it first seems.
Source: been selfhosting for an embarrassingly long time without any backup!
Hnnng...!