8mm tape capacity and Backup scripts

[Yates, John H.]

What is the MB capacity of a 600' Sony 8mm tape on SGI's 8mm drive?

What is considered the "best way" (uh oh... I can see hundreds of
opinions coming...) to back up a live system (e.g. sample scripts)?
(Backup, bru directly, or...)

I have three 1 GB disks, can't umount any partitions, and a full Backup
more than fills one 8mm tape. The Backup must be suitable for complete
system recovery in the event of disaster.

If I use Backup / , I get all disks and thus more than one 8mm tape.
If I select /usr, /bin, /etc, /u0, /u1, etc., I miss important stuff,
esp. at / .

I'd like to back up each disk completely independently so it can be
done unattended, overnight, and all we have to do is remember to
rotate tapes in sets of three.

Thanks, John
yates at c.chem.upenn.edu

P.S. I am very, very far behind in bulletin board stuff. I owe a summary
     and some personal responses about VMS save set readers. I haven't had
     time to even fire it up yet myself. I hope to find time soon.