Backup Policy
Different storage areas on Anunna come with very different backup guarantees. Knowing which is which is essential: some areas are never backed up, and data lost there cannot be recovered. This page summarises the situation; the page for each storage area gives more context.
| Storage | Backed up? | Notes |
|---|---|---|
| /home | Yes — to tape, restorable from roughly a week of history. | Good for configuration files and small results you can't afford to lose. |
| /lustre/nobackup | No. | The default Lustre area; cheaper, but lost data cannot be recovered. Keep your own copies of anything important. |
| /lustre/backup | Yes — a second copy on a separate machine. | A disaster-recovery copy, not a versioned backup. It may help revert a mistake if you report it very quickly, but there is no guarantee. |
| /lustre/scratch | No. | Temporary area; files may be purged automatically (typically after 30 days). |
| /archive | Yes — to tape, restorable from roughly a week of history (same schedule as /home). | Warm storage on the login nodes, for WUR users. |
Recommendations
- Treat
/lustre/nobackupand/lustre/scratchas expendable. Anything you cannot regenerate should also live somewhere that is backed up, or be archived to tape — see Archival Storage. - A "backup" tier protects against hardware disaster, not against your own mistakes. If you delete something by accident, report it immediately; recovery is best-effort.