05-30-2012 09:13 AM
Hi,
I'm wondering if someone could clarify a couple of things for me. I want to use a synthetic backup policy in BE2012 to do a daily archive to tape of approx 300GB data. Incrementals will be around 5GB per day. I have an LTO-5 tape drive and a 1TB disk storage location. Expanding the disk storage is not a viable option right now.
If I do a full backup once a week, and a daily incremental and daily synthetic job (followed by duplication to tape), how can I ensure I don't run out of space on disk very quickly?
I am happy to keep everything but the last one or two backups on tape, so what I am hoping is that I can set the full, incremental and synthetic disk jobs to have an expiry time of one day. Am I correct in thinking that once I have done a synthetic backup, I no longer need my full backup to create the incrementals? I think they are created from the last synthetic? Is that correct? Or do they still get made from the full backup and previous incrementals.
Basically, would the following occur?
Day one:
Day two
Day three
Day four
Day five
Day six (next week)
Does that make sense?
Thanks,
Richard
05-30-2012 06:37 PM
When you do a synthetic backup, your next incremental backup will use this synthetic backup as a reference. There is no need to keep the previous full/synthetic backup and the previous incremental backups.
It would be a better use of resources if you do less synthetic backups. Do it once a week in place of your full backup. The idea of doing synthetic backups is that you don't do full backups.