I only use cumulative incrementals, not differentials, so there is never more than one incremental to apply. This gives me a good mix of fast/small backups and fast restores and works great for me, but like everything - it depends. I run weekly L0 incrementals, nightly L1 incrementals and hourly archive logs - all straight to tape via Netbackup. I use the change tracking log so the L1 incrementals only take about 3 minutes for a 150GB database, but of course that depends on the number of blocks you change. For most systems, only a very small percentage of blocks are changed though. Another consideration is that incrementals are only available with Enterprise Edition, but I think that may have changed with 10g. Regards, Brandon ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Dennis Williams I think he has a point that too long a chain of incremental backups could create a problem. Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.