Backup file too small?

I did a complete new backup onto a 1Tb TC I had previously used for backup (but deleted the old bakcup file). I have 214 GB on my HD, and TM said it was backing up about 214 GB, but it stopped at about 175 GB and said it was done! No further incremental backups add much of anything. I can't identify any particularly large folders or files that it missed, but I can't compare everything. a 35 GB difference is pretty big. Any thoughts about whether I should worry that the HD is not completely backed up, or how to remedy this?
I did have previous problems with a "read only" TC, and then "backup file too large..." (the latter which I solved by trashing the TM .plist preferences file right before I did this big backup.)
Macolyte

Olaf is right it must be compressed backup:
To check if the backup file is compressed or not
RESTORE HEADERONLY FROM DISK = 'Path to backup file';
Looks for column labelled "Compressed". 1 = compressed, 0 = not compressed.
If you are skeptical about backup file you can verfiy whether a SQL database backup can be read and restored:
RESTORE VERIFYONLY FROM DISK = 'Path to backup file'
If the backup is valid, the SQL Server Database Engine returns:
The backup set on file 1 is valid

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Backup file too small?

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