Really tough from drop through velvet unless unique body features. I will set up folder for a new year, then sub-folders for points, spike, cow, fork, 6, 8, 10 etc. As I go through a batch of picks I copy/paste bucks into main folder, later goes through those and slide to appropriate subfolder. Within let's say the 8s folder, pic deer, make unique folder for him, 8-1, 8a, crabclaw, whatever. It's time consuming.
As far as individuals, unless clearly unique, brow time position, angle, and length usually vary enough to ID. G2 and G3 length and angle plus unique bends, knots or twisted tips help. Of course kickers or trash around bases can ID.
One tip is don't keep every pic of every buck. Once you've started, skip bad pics of known bucks unless place/time is of interest. You'll have some bad pics left outside of subfolders where you know he's different but pick won't allow good point count. You might get better pic later that matches up completes classification. The little guys are the hardest to pinpoint and require clear closeups. As season goes on you will recognize 90% at a glance or quick zoom. Laptop while watching TV works best.
Jon