Lost my project due to collab "restore"

I have not used collab but if you committed work to it, the work SHOULD be there, I assume.

I recommend methodically working through the “how to restore particular commits” in collab. Start a fresh project, put it under collab, make a commit, make another commit, back up in time, etc, and 100% understand how it works, then go see if you can rescue your original project. Obviously it is completely dependent on proper use of collab, as well as collab not having failed or had a bug.

I’m sorry you’ve had this issue. Please consider using proper industrial-grade source control in order to guard and protect your hard-earned work.

Personally I use git because it is free and there are tons of tutorials out there to help you set it up as well as free places to host your repo (BitBucket, Github, Gitlab, etc.).

As far as configuring Unity to play nice with git, keep this in mind:

Here’s how I use git in one of my games, Jetpack Kurt:

Using fine-grained source control as you work to refine your engineering:

Share/Sharing source code between projects:

Setting up the right .gitignore file:

Generally setting Unity up (includes above .gitignore concepts):