Time Machine says not enough room on disk

Time Machine says that I do not have enough room on my backup disk.  It is a 1 TB Drive, with 992 GB available.
I only want to back up my programs and data, which, if a full backup, is 662 GB, but for some reason, I am being told that I have 2.6 TB of data to back up.  I have no idea where all of this other data is coming from, is there any way I can select what I want backed up?  Effectively I want to back up my boot drive, and my data drive, that's it.  I do have two other drives in my tower, and they are full of data, but I do not need to back them up, and they may be what is causing the problem, but I don't know how to remove them from my backup list.
Any help or direction would be appreciated.
Thank you.

About TM "Backup Drive is Full" Alert
TM only deletes older files if they have been deleted from the source and when TM needs space on the backup drive for a new incremental backup. Time Machine "thins" it's backups; hourly backups over 24 hours old, except the first of the day; those "daily" backups over 30 days old, except the first of the week. The weeklies are kept as long as there's room.
So, how long a backup file remains depends on how long it was on your Mac before being deleted, assuming you do at least one backup per day. If it was there for at least 24 hours, it will be kept for at least a month. If it was there for at least a week, it will be kept as long as there's room.
Note, that on a Time Capsule the sparsebundle grows in size as needed, but doesn't shrink. Thus, from the user's view of the TC it appears that no space has been freed, although there may be space in the sparsebundle.
Once TM has found it cannot free up enough space for a new backup it reports the disk is full. You can either erase the backup drive and start your backups anew or replace the drive with a larger drive.

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