I have this particular repo set to push when I commit, so I commit when I'm done doing data entry for the session. When I push my reporting web app automatically updates it's postgresql database so I can go run reports and look at the data.

For me, just a master branch. Commit before/after destructive or cross-cutting changes, and "once in a while" in the course of adding regular activity. Also I use a script to mount a remote on an encrypted file system and push to it, for backup.

All the time (many times per hour when doing bookkeeping).

But I use git & remote bare repos as a backup & multi-device sync method for nearly everything I do on my systems, so I'm pushing very frequently.