I'm evaluating Bacula to replace both halves of our current backup system, which works like this:
- Each night dirvish collects incremental changes (via rsync) from all the servers and puts them on a file server with lots of reliable disk storage (online disk-based backups). Dirvish keeps hard-link trees of the last few months of data from the servers (about 1 TB total) on this server. These files are shared and users can browse them to recover their own files, but this is not a requirement of a new system. - On weekends, a single DLT tape captures a full backup of the latest dirvish tree (tar). The tape is taken off-site and the "oldest" tape from the off-site pool is put in. These tapes are for disaster recovery and only hold full backups. Our full backups no longer fit on a single tape, so I'm looking at buying an autochanger. I plan to let Bacula span data over the tapes (volumes) in an "offsite" pool. I'm trying to understand how Bacula's pools/volumes/labels will interact with my strategy for moving the volumes in this pool off-site ASAP after the weekend (Monday). I've never planned backups for an autochanger before. Let's assume I need 3 tapes for a full backup, run once each weekend. I label 12 tapes (4 weeks worth) and put in tapes 1,2,3 for the first weekend, and backups run. On Monday, if I remove 1,2,3 and put in 4,5,6, and we assume 4,5,6 can be auto-recycled or are empty, will Bacula complain when the weekend arrives and tape 3 (where it left off) isn't there? Will it just use 4,5,6 and be happy? Can this pattern be repeated indefinitely (until I replace old tapes with new ones)? My second topic has to do with migration. After installing Bacula 2.2.4 and playing with it a bit, it seems my current strategy (incremental/differential on-line disk backups with a full image copied to tape regularly) can't be mimicked with a Migrate job--I would lose the jobs and data from the disk-based backup pool when they migrated to tape. Is anyone else doing something like this with Bacula? --=20 Shaw Terwilliger <[EMAIL PROTECTED]> SourceGear LLC
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