I was going through my photos in Lightroom, adding keywords, and somehow the develop settings to all my images from 2012 and earlier changed; everything zeroed out except clarity, vibrance, and saturation... and those three are now the same for all of them. The more recent years have not been affected.
Is it possible to restore the previous settings with a catalog backup but only for part of my library? I've done a lot of work on more recent stuff the past couple of weeks that hasn't been backed up . So I'd hate to lose that by going back and restoring everything from my last backup.