Dieter Stueken wrote 67 lines: > But seriously: there is some other interesting possibility. After you > made the snapshot, don't try do save it elsewhere. Instead just keep it! > I use a similar system since a year now. It holds a full mirror of > all my data, thus its some kind of full backup. Each night I > synchronize all modified files, but keep the previous state, too. > Its like a snapshot. As all unchanged data is shared between the > snapshots, the whole thing grows quite moderately compared to its > total size (200Gb). > Thus I have a snapshot of all my data for each day. I save them daily > for about a week. Then I thin them out, keeping the Sundays only. > After a few weeks I keep one snapshot per month etc. This is equivalent > to dealing with a bundle of tapes, but much much easier. Sounds interesting. How does defend against: - hard disk head crashes - a lightning striking your PC, roasting your HDs (and any tape drive, and all the rest) - software errors (e.g. in LVM, in your scripts) - operator errors (removing the wrong snapshot(s)) - cracker attacks - corrupted main file system (even fdisk giving up), due to some software/hardware problem (e.g. cable came half off) With a backup which migrates/copies the data to tapes, I can at least: - replace broken HDs/computers - know the data was at least readable at the time of the backup, and any later accidents are recoverable - it's much harder to nuke 2+ tapes/backup sets by operator error. -Wolfgang _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
