Noob SourceTree questions

Hi everyone, this is my first post on these forums. I’ve worked my way through Terminal Hacker and now I’m pretty deep into Project Boost. I’m a very habitual “SourceTree Commiter,” and I’ve got at least 20 versions of backups (if I’m saying that right).

I’ve got three questions.

#1 - When I’m about to back up my version, I do the following first:

1- Save Visual Studio file(s)
2 - Save Project in Unity 3D
3 - Save all scenes in Unity 3D

My first question is, do I need to do all three steps? Can I just do step #2 for example?

#2 How do I call up previous commits from SourceTree? In other words, how do I jump around between commits? Say I mess something up, how do I go to a previous build. Or say I just want to SEE a previous build, how do I get back to my newest build.

#3 Technically speaking, am I in danger of my file getting very big if I keep commiting incremental changes? Is this thing going to be 100 gig at some point? How do I check that?

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