Pika vs Timeshift vs Deja Dup...etc

Hi all, Just wanted to know, do these all work the same? I have ext4, so no snapshots on timeshift, but I’m using it now to back up to an external SD card. I have heard good things about Pika and dejadup, and had some mishaps with timeshift. So, my question is, do they all do the same thing? Like, if I messed up something, can...