> 1. Would I be better off using migration instead of spooling?  e.g. back up
> everything to disk overnight and then later migrate to tape.  I am probably
> OK for disk space, and my main aims are to get backups through as quickly as
> possible and prevent my LTO2 drives from shoe-shining.
>
I have no experience with migration so I can not comment on that.

> 2. Is spooling better geared to using a few Gb only of disk space just to
> buffer up the tape drive and keep it moving?
I have 30 to 40 clients that get backed up each night. What I do is
set the spool size to 2GB and have concurrent jobs running to the same
tapes.

> 3. Is it recommended to keep Windows and Solaris backups on separate volumes
> (tapes) or is it OK to mix them.  I think if I used the same tapes for
> everything there would be fewer opportunities for delays, but I don't want
> to introduce problems by doing so.
>
I have all my system (linux and windows) backups going to the same
pool. But my user backups and other specific jobs go to different
pools.

John

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