the only option having independent Full Cycles (one for Disk, and another one for Tape) is having multiple backupsets.
But I'm absolutly sure: you don't want to run synFull backups against Tapes !
This might take ages to complete, because previous Full has to be read from tape and merged w/ incr done to tape.
It can be a good Idea to
- run weekly synFull to disk
- create a selective AuxCopy on each Full to Tape
by this you end up in 4 synFull on disk per month (instead of one) but if you use Dedupe, this schould not add to much data on the disk.
If you realy have to, you can age the data on Disk in between the monthly cycle, but the last (active) cycle will always remain on disk