Política de preservación digital

The information contained in the "Periodic Publication System" (SPP) is stored on different digital media on a daily and weekly basis. The media used for the "backup copy" are hard drives and magnetic tapes.

Backup copy on hard drives: two hard drives are used. The hard drives are configured with a RAID 1 scheme. In addition, another copy is made on a remote backup server that is located in a different physical location from where the main SPP server is located. This copy is made every 12 hours, without compression and/or encryption.

For backup copies on magnetic tape there are two schemes: daily and weekly backup copy.

Daily backup copy on magnetic tape: a total backup copy of the SPP is made every 24 hours. For this process, a total of 18 different magnetic tapes are used in a rotating scheme. One magnetic tape is used per day, and the magnetic tape containing the oldest backup copy is overwritten. This gives a total backup time of up to 25 days back.

Weekly magnetic tape backup: Each week (every Saturday) another complete backup copy is also made on magnetic tape. For this backup copy, 10 magnetic tapes are used in a rotating scheme. Each new backup copy is made on the magnetic tape containing the oldest copy, which gives a total backup time of up to 64 days back.
The files on magnetic tape are stored in "zip" format, compressed by the backup copy management system. In the event of a failure of the magnetic tape reading/writing equipment, there are two read-write equipment that can be exchanged. The magnetic tapes of the daily and weekly backups are stored inside a fireproof container (safe).

Database backup: A daily backup (dump) of the system database and a backup of the complete database engine are applied with the capacity to recover from failures up to (5) five minutes prior to the failure. In addition, the database server is replicated on two nodes, both of which have RAID 1.