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Kevin van Haaren <kevin@×××××××××.net> writes: |
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[ ... ] |
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> I think a properly implemented tape backup still has it's place. |
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the problem with tapes is that implementing a proper backup routine |
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has some icky logistical issues. |
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> Done properly it gives you the ability to recover older versions of |
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> files. |
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I take backup to disk, of course I can retrieve older versions of |
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files. I can retrieve the file as it was any day over the last |
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year, and a bit more rarely after that. implementing a certain |
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number of changes backward in time is also fully doable. |
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> The media is reusable and higher density than CD-R or DVD. It's |
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> reasonably fast, and takes up less space than a multiple hard drive |
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> solution. |
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tapes take up a lot of space, a lot more than harddrives. at least |
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in my experience. |
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> But it really is only one phase. I prefer a 3 phase system: |
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> 1) RAID for fault tolerance |
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> 2) tape backup for system/file recovery |
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> 3) optical media for archive |
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that's a pretty nice layout. I do RAID for fault tolerance, backup |
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to another drive in another box, offsite backup via cron / ssh / |
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rsync / hardlinks (done by bontmia) and occasional backup to DVD. |
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> At work we've had a rash (3 systems out of several hundred) go bad |
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> with multiple hard-drive failures, so RAID wasn't even sufficient |
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> fault tolerance and we had to fall back to restore from the previous |
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> nights tapes, but our most common use for tape backup is recovering |
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> older versions that were accidentally deleted/written over or |
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> corrupted. |
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backup to disk doesn't translate to RAID. |
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> But archives must last a longer period of time than tape so a well |
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> cared for optical media gives longevity that tape just doesn't have. |
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both tape and optical media die eventually, as does harddrives. |
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with optical media you can implement checksumming to see if danger |
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lurks, with harddrives you make incremental backups to another |
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RAIDset where the drives are tested implicitly. |
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-- |
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Terje |
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-- |
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