I just bought a new 27” iMAC, attached the old Time Machine external HDD to it and ‘Restored’ the latest backup from my old 9-year old machine which had died. Everything went well on the restore’ feature. Unfortunately, when the scheduled backup to the Time Machine came due, it indicated that only 14 GB of storage remained and it would not automatically back-up. I’ve checked the System Preferences and the data on the Time Machine indicates it should be deleting the oldest backup when the unit is full. After trying various repairs through the Disk Utility, I thought (bummer) that I would simply ‘highlight’ the backups on the Time Machine over a year old, move them to the Trash can and then delete them. This I did, but when I tried to empty the trash can via ‘delete immediately’, the unit ran for 24 hours and continued ‘calculating sizes of Trash Folders…’. Thinking there must be a glitch, I stopped the backup and then tried with my ‘Clean MyMAC 3’ program. I selected the ‘trash bins’ as the item to clean – it has now been running for over 28 hours and appears to show only about a ¼ being in the ‘found’ arena. At this rate, it will take something approaching 120 hours to acquire and show ‘Found….TB’ and who know how many to ‘erase’ this humongous amount of data. Question – is there any way to delete this trash more rapidly or easier when the volume of data in the trash can is detected as so large?