11.3 U2 Legacy Periodic Snapshot Tasks

I upgraded to 11.3 U2 a few weeks ago and so far so good! I just was going through some maintenance and realized about half of my periodic snapshots are showing as legacy and the other half are not. For the life of me, I can't figure out what is different between them, nor what this actually means.

Is there any advantage to the new system vs legacy? And would I just have to recreate the legacy tasks as I don't see an "upgrade" option.

Any help insight to this would be great!