Hi @petarpavlov,
I do not know exactly what changes are you making, but I suppose you were styling your page with global classes. In this case, these classes will not revert to the previous state, when you apply a revision.
I’ll quote @timmse here, as he explains this very well in this post:
A page/template revision in Bricks follows the same principle as normal WP post revisions: it is a collection of snapshots of the page’s elements data, with each snapshot generated on builder save.
Classes are not specific to a page, so they are not part of the page revision, just as theme styles or color palettes are not part of revisions.
So, with all this information, I would say it’s not ok to rely only on revisions, but if you think you will revert that, it’s best to create a backup.
I’ll also mark this as a NO BUG.
Best regards,
M