GPFS mmbackup and monthly retention

Guys

I want to do a monthly and yearly retention for a GPFS filesystem. What i learned that whenever you run mmbackup , it will always used selective TSM backup in back ground.

If this is the case what is difference between running mmbackup with incremental and full options ?

Also if we need to implement a monthly archive or yearly archive , but in background if we dont have TSM archive function capability then what settings of verexists , verdeleted to be used to ensure monthly/yearly retentions?

Please advice