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HathiTrust uses TSM, which dispenses with the notion of full backups, for our tape backup. The "weekly or monthly full" convention is somewhat of a vestige of tape environments prone to segmentation, or for pure convenience of recovery, and in particular, it is antithetical to VTL environments. We run nightly incrementals which are replicated to another site (also on tape). Our tapes are encrypted. One point worth noting that relates to trustworthy digital preservation: it is critical to tie the previous-version retention of your backup system to your fixity check schedule. We do fixity checks no less frequent than quarterly and we retain previous versions for 6 months. If a fixity check detects bit rot - hasn't happened, BTW - we have a wide margin that allows us to retrieve the version of the rotten file that passed the most recent fixity check. On 08/28/2012 10:11 AM, Schmidt, Lisa (lschmidt) wrote: > Hello, > I'm an electronic records archivist at the Michigan State University Archives, new to this list. Unfortunately, I will not be on the call this afternoon due to another meeting, but I am hoping to make it to future calls. > > We are developing the Spartan Archive preservation environment for electronic institutional records with permanent retention, and I have a "due diligence" question to pose to the group. > > The MSU Archives wishes to ensure that we are following best/good practices in backing up the Spartan Archive, 10-20 TB of space that includes preservation masters, access copies, and a processing area. > > How frequently are you backing up your preservation repositories? Is the standard recommended daily incremental/weekly full backup happening in practice? > > Thank you! > > Lisa Schmidt > > ____________________________________________________ > > Lisa M. Schmidt > Electronic Records Archivist > University Archives& Historical Collections > 888 Wilson Road > Room 101 , Conrad Hall > Michigan State University > East Lansing, MI 48824 > > [log in to unmask] > 1-517-884-6441 > > > ############################ > > To unsubscribe from the NDSA-INFRASTRUCTURE list: > write to: mailto:[log in to unmask] > or click the following link: > http://list.digitalpreservation.gov/scripts/wa-DIGITAL.exe?SUBED1=NDSA-INFRASTRUCTURE&A=1 ############################ To unsubscribe from the NDSA-INFRASTRUCTURE list: write to: mailto:[log in to unmask] or click the following link: http://list.digitalpreservation.gov/scripts/wa-DIGITAL.exe?SUBED1=NDSA-INFRASTRUCTURE&A=1