TM with multiple backup drives.

Maybe this has been answered before, but I can't find it.
I have 2 external drives a 1.5TB and a 1.0TB drive I wish to use for TM. I have about 1.2TB to backup across to volumes: 1) the OS partition (and drive) - 500GB max and a data volume- 1.5TB max. Currently everything is 1.1 TB total.
If I use the 1TB external drive for TM it complains it isn't big enough (the 1.1TB backup size) So what I want to do is backup the OS dive to the 1TB external and the Data Volume to the 1.5TB external drive.
Does TM allow this?
If so I can't figure it out. I can't select items to exclude per drive selected to backup to...

Hi, and welcome to the forums.
Not exactly. TM backs up to only one "volume" at a time.
However, you might be able to put the two TM drives into a "Raid" set that is a single volume; for most purposes, including display on your desktop and/or Finder sidebar, the set will appear to be a single disk. TM would then back both "source" drives up to the single volume.
Start Disk Utility (in your Applications/Utilities folder). In it's Help, select +Using Raid Sets,+ then
+About Concatenated RAID sets+ and +Concatenated RAID.+ There's step-by-step instructions on how to make and deal with these.
Do note that the usual rule of thumb is that TM needs 2-3 times the space of the data it's backing-up, so while you may be able to get TM working, you still may not have enough space for it to work well. This depends mostly, of course, on how you use your Mac. If you frequently update lots of big files, TM may not be able to keep backups for very long. If you're a relatively-light user, your setup might be acceptable. It is, of course, a trade-off between space and depth of backups.
Let me recommend that for your first backup, you exclude the external disk (via TM's Preferences > Options). Even that will be lengthy. Then remove the exclusion and be prepared for another long backup of everything on the external drive.

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