What should I look to backup for SSMV2 to SSMV3 migration before it takes place?
It is recommended to make copies of the resource and action tables before performing the load function from the Policy Manager panels.
To do this, use the OPSVIEW panel 2.6 to create copies of the STCTBL and STCTBL_ACT tables.
Additionally, you may want to backup the SYSCHK1 dataset that contains all the tables and global variables.