How often are the files in my home directory backed up?

Each directory within your home directory contains a hidden file called .snapshots. This file cannot be seen using ls -al, but you can cd into it. The .snapshots folder contains hourly, daily, and weekly backups of its parent directory. Hourly backups are kept for the past six hours, dailies for the past two days, and weeklies for the past two weeks.

The .snapshots directory is synced to a server in another building on campus daily. This backup is stored in ~/.snapshot/snapmirror.*.

And no, there is NO way to undelete a file once you’ve erased it using rm.