On 03/13/2012 08:09 AM, m.roth@xxxxxxxxx wrote: > Tilman Schmidt wrote: >> Am 13.03.2012 00:48, schrieb Nataraj: >>> I have been sucessfully using 8GB dual layer DVDs for some of my >>> backups/archiving and now that the price of Blu ray has come down I am >>> about to experiment with that. I have been writing dump format files to >>> the DVD's and then writing an SHA256 checksum for each dump file so it's >>> very easy to verify the integrity of the dump. >>> >>> I am also about to try daily emcrypted backups to http://rsync.net along > 1++ > >>> with periodic archival to blu-ray disk for one of my backup needs. >> In my experience, the long-term stability of DVDs is rather >> questionable. I've had quite a few nasty surprises with DVDs. >> Even single-layer ones regularly turn out to be unreadable >> after two or three years, and double-layer ones are worse. >> I don't know if Blueray is any better in that respect. > Yup. I've been reading about that instability for several years now: the > commercially-produced ones are ok, but not the ones you write; they will > *not* last the same number of years. > > mark > mark > > _______________________________________________ > CentOS mailing list > CentOS@xxxxxxxxxx > http://lists.centos.org/mailman/listinfo/centos Good point. I've been following the recommendations in articles such as this http://adterrasperaspera.com/blog/2006/10/30/how-to-choose-cddvd-archival-media/ using mostly the Taiyo Yuden and verbatim media where I could identify the country of origin and the dyes and so far I've done ok. A good reminder for me to check some of my back archives. I also have this same data stored on hard drives, so there is redundancy. As some have pointed out, if you really need long term archival of data I think a good plan would include periodic testing and refresh of media or rewrite to new media. Nataraj _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos