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I did have:

1 TB internal drive with about 250GB total of material
1 320 GB drive with Time machine backup
1 500 GB drive with CCC backup

Wanting to retain High Sierra for 32 bit applications and newer systems for future use, I reconfigured the 1TB internal drive (350BG for 32 Bit, 650GB for 64 Bit) and restored the 250GB of material to each with my CCC backup.

I configured a new external 1TB drive (350BG, 650GB) and created new CCC clones.

Everything has been checked as bootable.

For my Time Machine backups, I wanted to have the 320GB drive for one and the 500GB drive for the other. Note: My previous 350 GB Time Machine always worked, except once in a while it would say "not enough room" and I'd redo it. That's not an issue for me as I don't need Time Machine to go back forever.

But, now I have two drives that Time refuses to use for the planned TM backups. It says there is not enough room to create a TM backup. Grrrr. It seems that TM now wants to have more space than needed for the actual material.

How do I get around that issue?