# Backup on Betzy, Fram, Saga, and NIRD¶

Warning

Only home directories with enforced quotas are backed up

Any $HOME area using more then 20 GiB or more than 100000 files is not backed up. To have your$HOME backed up, you need to shrink the disk usage below the 20 GiB limit and below 100000 files and notify support.

If “dusage” repots 0 Bytes limits, this means that you do not have disk quotas activated and this means that these folders are not backed up.

Warning

Betzy: NO BACKUP

Backup on Betzy will be switched on only after the pilot period is finished.

Home directories on Betzy, Fram and Saga (/cluster/home/$USER) are backed up nightly to user’s home directory on NIRD (/nird/home/$USER/backup/fram or /nird/home/$USER/backup/saga). $HOME/nobackup and $HOME/tmp directories are excluded from the backup. The nnXXXXk project directories (/cluster/projects/nnXXXXk) are backed up nightly to NIRD. The shared areas in /cluster/shared are not backed up to NIRD. The scratch areas in /cluster/work/jobs and /cluster/work/users do not have any backup. ## NIRD¶ Both home directories (/nird/home/$USER) and project areas (/nird/projects/NSxxxxK) have backup in the form of snapshots and geo-replication.

Snapshots are taken with the following frequencies:

• /nird/home/$HOME: • daily snapshots for the last 7 days • weekly snapshots for the last 6 weeks • this also includes snapshots of the Betzy, Fram and Saga home directory backup • /nird/projects/NSxxxxK: • daily snapshots for the last 7 days • weekly snapshots for the last 6 weeks Snapshots are available at the following places: • /nird/home/u1/.snapshots • /nird/projects/NSxxxxK/.snapshots ## How to recover deleted/overwritten data¶ To recover a deleted or overwritten file /nird/projects/NSxxxxK/dataset1/myfile, you can copy a snapshot back to the folder and restore the deleted/overwritten file: $ cp /nird/projects/NSxxxxK/.snapshots/DATE/dataset1/myfile /nird/projects/NSxxxxK/dataset1/


Select the DATE accordingly to your case.

Similarly, a deleted/overwritten file in the home directory can be recovered like this:

$cp /nird/home/u1/.snapshots/DATE/$USER/mydir/myfile /nird/home/\$USER/mydir/


Note that snapshots are taken every night only. This means that deleted files which did not exist yet yesterday cannot be recovered from snapshots.