Stable update: 'Move to' behavior, timeline examples and more.
One of the reasons to keep regular backups is in case of software problems, so hopefully you have something recent to restore. If not email your project to ashleynjy@scirra.com and I'll see if it can be recovered.
C3 does work offline. We are also experimenting with local save options at the moment: construct.net/en/forum/construct-3/general-discussion-7/experimental-local-file-147071
If you can repeat it please file a bug report following all the guidelines and it will be a top priority for us to fix: github.com/Scirra/Construct-3-bugs
Please be sure to follow all the guidelines though, since we need all that information to be able to help.