Claus, Robert's suggestion is good, we backup maildir, with 5.9TB in 2 hours to SATA , we also run a backup of that backup, so we have two extra copies (this is on top of NAS snapshots) tape is just too slow for anything serious these days.
N ik On 12/5/13, Claus <clau...@bayern-mail.de> wrote: > Am 02.12.2013 20:37, schrieb Robert Schetterer: >> Am 02.12.2013 18:47, schrieb Claus: >>> Hello, >>> >>> i have to backup (tape library) a mailsystem with about 300.000 >>> Mailboxes on 2 backends. Summary of all mailboxes are 2 TByte. >>> The mailstore is mdbox. >>> Is it save to do a simple filesystem backup (full and incremental) with >>> backupsoftware? >> hm i wouldnt do that with mdbox, cause it does strongly depends to >> index, but if you use dsync you could convert to maildir at backup, >> maildir should be fine to store on tape, but with 2 TB this is only good >> for total desaster archive, i guess it would take long time to restore >> specially single mailboxes in acceptable time, from tape >> Better use cheap sata storage raids for frequent backups, and do tape >> snapshots sometimes. >> >>> What is the prefered strategy to do a backup for desaster recovery >>> (mailsystem crash) and restoring single usermailboxes? >> dsync should do fine >> >> http://wiki2.dovecot.org/Tools/Dsync >> >> but there is no universal answer to this, perhaps filesystem snapshots >> strategy might better, it depened on your general setup , filesystems , >> mailstore etc. >> >> wait for others report their solutions, and find the one fits best at >> your place >> >>> >>> Regards, >>> Claus >> >> >> Best Regards >> MfG Robert Schetterer >> > thanks for your answer, > the main reason we plan to use mdbox is to reduce backuptime. > Now we are using Maildir on cyrus and the (full)-backup takes about 20 > hours on one backend storing 150 GB of Mails in about 3 million files. > Because of that we have many backends, so we can parallelize the backup > prozess. > > greets, Claus > > > > > > > > >
