Something went wrong with my Obsidian instance, when I open my vault the CPU usage gets to 20% and I can’t work with Obsidian.
Apparently one plugin is causing the problem.
I would like some advice on how to turn on Safe mode without the UI of Obsidian?
With Obsidian or that vault closed, you could move or rename the {VAULT-NAME}/.obsidian/community-plugins.json file.
This will keep all your community plugins, but they will be disabled when you reopen the vault. This is very low impact, and a way to start Obsidian with all community plugins disabled.
Thanks for the advice, now Obsidian is ready to use.
I would also like to ask for advice on how best to reconstruct a copy of the original vault.
I create a new empty vault and just copy the entire contents of the original vault into it? And then gradually add plugins?
Sure, you could do that.
The entire content includes the .obsidian/ folder with all the core settings you changed, community themes, css snippets (if you have any), community plugins and their settings.
If you want to start fresh with just your files, skip that folder.
If you do copy that to the new vault, just be careful to not copy the problematic plugin(s) over.