The HNAS file server saves old versions of files so that any user can retrieve them.
The default snapshot time schedule looks like this: (2017-06-21)
- Every 15 minutes for an hour
- Every hour for a day
- Every day for a week
- Every month for two months
In Windows open Properties of a file or folder and then in the Previous versions tab pick an appropriate version.
In macOS mount with an extra /~snapshot in the path to access the snapshots folders. Use your own university account instead of the example below.
Then enter the appropriate folder to search for the lost version.