On Mon, 9 May 2005, Michel Meyers wrote:
Incremental is a little different: It backs up the files changed since the last backup (be that Full or Incremental)
Or differential.
. As a result of that, to do a full restore you will need the last Full backup and ALL Incrementals that happened since then.
You can also do it in the order "Full, most recent differential, every incremental since the differential"
My longest full backup cycle is 6 months long (6+Tb datasets) with monthly differentials and daily incrementals.
For stuff like this it'd be nice to have more sublevels, like the "Dump" program's old 9 levels of backups - at that point I'd be doing weekly sub-differentials. The downside of that flexibility is massive extra complexity and difficulty understanding how to use it effectively.
Having said that, I have 3 types of restoral problems on average:
1: Bare metal restore. Rare, but the whole reason Bacula exists here.
2: Users coming in screaming "Arrgh, I just deleted xyz important file and I needed it yesterday, get it back!"
(Previously it could take up to 12 hours for the old tar-based scripts
to find and restore a file. Now Bacula finds them on average in 3-4
minutes.)3: Users coming in realising they deleted a file last week/month and needing it back. They're usually happy campers when I can not only get it back, but offer a choice of the last 5-6 versions they saved.
(This isn't quite as good as VMS's versioning of saved files, but it's
ben useful...)
AB
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