All files in every project are snapshotted every couple of minutes. You can browse your snapshots by clicking the “Backups” link at the upper right of the Explorer file listing.
Snapshot storage does not count against your disk space quota. We provide all snapshot space for no additional charge.
Also, CoCalc records the history of all edits you or your collaborators make to most files, and you can browse that history with a slider by clicking on the “Time Travel” button in sthe (next to save) in files.
We care about your data, and also make offsite backups periodically to encrypted USB drives that are not physically connected to the internet.