The document discusses various options for backing up data to address limited storage library capacity. It recommends using disk storage instead of tape due to lower costs and easier incremental upgrades. There are two types of disk solutions: virtual tape libraries that emulate tape storage, and archival stores that copy files individually for easier access and restore of individual files. While most people opt for virtual tape libraries, the document recommends an archival storage solution as files often need to be restored individually rather than full systems. It raises some challenges with archiving data from OS X and Microsoft Exchange.

1. What to do about backup? Doug Moncur

2. Capacity, Capacity Too much data to back up, not enough capacity Limited by existing STK library capacity Adding a new library way outside of budget

3. Use Disk dear boy, use disk Disk is (allegedly) cheaper Disk is incremental - no massively expensive upgrades No costs for media Disk store could be backed up to existing STK drives if desirable

4. 2 sorts of disk Virtual tape library - emulates a tape library Can use existing software Data stored in tape images Retrieving files as difficult as now Easy versioning

5. 2 Sorts of disk Archival store Files copied on a per file level Easier to find and restore individual files Versioning possible

6. What do most people do? Virtual tape No brainer, fits into existing backup strategy Easy to move tape images to real tape

7. But we’re not most people Rarely need to restore full file systems Often need to restore files only Archive!

8. Archival solutions Off the shelf solutions not common Most commercial solutions block level windows oriented solution Eg EMC Legato Replicstor

9. Commercial solutions Copan systems Disk Array vendor, has Millenia Archive product that does file level copies Storhouse Versioning software copying solution, allegedly hardware agnostic

10. Non Commercial solutions Rdiff Works like rsync but does versioning No nice tools using rdiff would mean a lot of scripting Scalable and sustainable ?

11. Problem areas OS X Need to chanck solution handles data forks Exchange No archival solution really handles exchange Do ntbackup style dump of exchange to disk and archive it Use proper exchange aware backup tool for mailbox backup