Hello!

Amanda does a full backup of the /data on one day of the week and then
does level one backups for the rest of the week.  It does a level one
backup of the other 6 disks on the day it does the full of /data, and
then does full backups of the other 6 disks on the other 6 days.

Why does Amanda make so many full backups?

Probably Amanda sees that on the days when level 1 of /data is done there is plenty of tape space left over. In this case, Amanda may "promote" the smaller DLEs in order to better utilize the available tape space and enable faster recoveries (the less different levels you have to go through during recovery, the faster you can recover).

Is there a configuation parameter we need to set to change this?

'maxpromoteday' is probably what you're looking for.

--
Toomas Aas

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