how can I do to not include the /opt directory in the snapshots?
I don't care because it takes up too much space
/opt includes some applications that are managed by pacman like Heroic and Discord, excluding it may confuse pacman if you restore a snapshot. If you really don't want to exclude it, create an @opt subvolume and add an entry in /etc/fstab.
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You also need to create the subvolume and copy the data into the new subvolume.
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Please, no pictures from terminal.
Not searchable, just unnecessarily bloats the backup files from the forum.
We are not telegram or twitter with infinite resources. 
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