Time machine space issue
My SSD is 780 GB with 330 GB used and 450 GB free space.
My Time machine backup disk is 770 GB with 246 GB free space.
TM back up has failed because it needs 341 GB. This is slightly larger than the total amount of files in the SSD, so it appears that TM wants to backup everything. Why does it want to do that and how can I fix the glitch? Also, why does it not just free up space by deleting old backups?
The only clue I can provide about the potential cause of the problem is that yesterday I used the TM backup to restore to a different computer. Essentially I made a clone of the backup.
Thanks for your help.