Unique schedules for different directories or different protection groups for one disk

Hi,

There is a file server, with disk D. It has different directories: d:\ Folder1, d:\ Folder2, d:\ Foldre3. Directories has different size and importance. I need different schedule for each of them.
Is it really impossible to create a separate security group in DPM with its own schedule, for each directory on one partition. I can not create another (custom) protection group for d:\ folder01, because d:\ Folder01, d:\ Folder02 are in one of the protection groups.
«Other items on the datasource are a member of another protection group»

Or can not do, a unique schedule for each directory in one protection group.
In general, all the directories are very large and I do not need to perform a backup of ALL, every day, but only Folder01. Folder02 and Folder03 I want back up every week.

Tell me maybe I'm wrong :)

Thanks.