An advantage of snapshots is with active filesystems such as those used by a database. For a consist at database backup you of course need to stop the program then backup then restart ( or use some database tool if available) . The time to create a snapshot is essentially zero so the above start - stop is actually practical. Then you use your backup software of choice on the snapshot not the active file system.
On Sun, Mar 16, 2014 at 7:16 AM, roemer <uwe.ro...@gmail.com> wrote: > Thanks for the response, Björn. > The hint regarding dataset-specific snapshots is good, though I have to > first think about how I would best make use of them. > > However another point that you raised is interesting: > > On Sunday, 16 March 2014 10:34:52 UTC+11, Bjoern Kahl wrote: >> >> [...] >> >> Under Mac OSX, a mounted file system comes at higher costs than on >> other Unix like operating systems, due to the Finder and MDS services, >> so I would not suggest to really try to have hundreds of file systems >> mounted at the same time. But any reasonable number (some 10) go >> without noticeable performance impact. >> > > I would need about 10 separate mount points / data sets, so I guess this > would be fine. > MDS services however means Spotlight, but the MacZFS Wiki as well as > several other posts on the web give the advice to switch off spotlight for > ZFS with > mdutil -i off mountPoint > > Why is Spotlight thought to be evil for ZFS? > Or does your comment imply that these advices are outdated, and > mds-indexing for ZFS mount points is ok nowadays? > Note that I am mainly aiming to store static 'archival' data and documents > on ZFS, not my main user directory. > > >> [...] Snapshots can also easily be used for real >> off-site backups by the zfs send / receive mechanism. >> >> Haven't looked at send/receive yet, but if they require network > connections, I am afraid classical ADSL speeds with mac 1MBit/s upload will > not be much fun... > And for periodic backup to an external HDD I was thinking about ChronoSync > or simply rsync > > roemer > > -- > > --- > You received this message because you are subscribed to the Google Groups > "zfs-macos" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to zfs-macos+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- --- You received this message because you are subscribed to the Google Groups "zfs-macos" group. To unsubscribe from this group and stop receiving emails from it, send an email to zfs-macos+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.