On Jan 17, 2010, at 2:38 AM, Edward Ned Harvey wrote: >>> Personally, I use "zfs send | zfs receive" to an external disk. >> Initially a >>> full image, and later incrementals. >> >> Do these incrementals go into the same filesystem that received the >> original zfs stream? > > Yes. In fact, I think that's the only way possible. The end result is ... > On my external disk, I have a ZFS filesystem, with snapshots. Each snapshot > corresponds to each incremental send|receive. > > Personally, I like to start with a fresh "full" image once a month, and then > do daily incrementals for the rest of the month.
This doesn't buy you anything. ZFS isn't like traditional backups. > There is one drawback: If I have >500G filesystem to backup, and I have 1Tb > target media ... Once per month, I have to "zpool destroy" the target media > before I can write a new full backup onto it. This leaves a gap where the > backup has been destroyed and the new image has yet to be written. Just make a rolling snapshot. You can have different policies for destroying snapshots on the primary and each backup tier. -- richard > > To solve this problem, I have more than one external disk, and occasionally > rotate them. So there's still another offline backup available, if something > were to happen to my system during the moment when the backup was being > destroyed once per month. > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
