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====== Backups ======
Every computer is supposed to be backed up regularly. We want to be protected from:
  - ransomware/crypto attacks
  - catastrophic hard disk failure
  - user error, i.e.  accidental file deletion
  - data center failure 

We have a tape drive and library with 60 tapes (12 TB per LTO8 tape). 

In S204 it is consistent for all groups (AG Klitzing, AG Schneck, AG Liebchen, Helium):
  - daily backup on tape around 9:00 for all clients in S204 via Bacula Backup server.

In S207 it is more diverse, depending on work group:
  - AG Drossel has a seperate backup system and distributed home folders with a strong size limit of 15GB (daily backup on disk)
  - AG Blochowicz is integrated in the Bacula backup system (daily backup on tape)
  - AG Vogel has central home folders (daily backup on tape, multiple snapshots per day, flexible size limit)

We can restore file from the day before the backup, daily versions for a week, weekly versions for a month, and monthly versions for 3 months.
(TODO: more precise)