Backups¶
Danger
All NERSC users should back up important files to HPSS on a regular basis. Ultimately, it is your responsibility to protect yourself from data loss.
Snapshots¶
Global homes and Community use a snapshot capability to provide users a seven-day history of their directories. Every directory and sub-directory in global homes contains a ".snapshots" entry.
.snapshots
is invisible tols
,ls -a
,find
and similar commands- Contents are visible through
ls -F .snapshots
- Can be browsed normally after
cd .snapshots
- Files cannot be created, deleted or edited in snapshots
- Files can only be copied out of a snapshot
Backup/Restore¶
Global homes are backed up to HPSS on a regular basis. If you require a restoration of lost data that cannot be accomplished via the snapshots capability, please contact NERSC Consulting with pathnames and timestamps of the missing data. Such restore requests may take a few days to complete.
Purging¶
Note
See Filesystem Quotas and Purging for detailed information about inode, space quotas, and file system purge policies.
Warning
$SCRATCH
directories are not backed up