- SCSI CD-ROM drives.
- SCSI tape drives (DDS-3 or larger)
- Removable or external hard drives (40GB or larger)
The CD-ROM drive is to replace the borked one in my Sun E420R. The tape drives and external or removable hard drives are for my Linux server. I’ve been doing backups to a Seagate 250GB external drive. But it’s full now. It’s got a SCSI controller with nothing hooked up at the moment. I’ve got stacks of 120MB ZIP drives and I don’t want any more. A full backup of my server is 160GB so 40GB is the absolute minimum of a single medium. I know that DDS-3 tapes are 12GB/24GB but it’s much easier to switch a tape than it is to switch an external hard drive.
I have 78 backup jobs total, with 12 running daily. It follows the Tower of Hanoi sequence (0, 3, 2, 5, 4, 7, 6, 9, 8, 1A, 3, 2, 5, 4, 7, 6, 9, 8, 1B, etc.) with the level 0 sets never being overwritten and the level 1 sets being overwritten monthly. All other sets are overwritten each time that same level is dumped. Here’s the webmin view of the backups (only a few of the 78 are visible):