Hi, across the weekend I did the Yosemite upgrade and it all went seamlessly onto my 2014 MBP 13" Retina. As some may recall, I have previously had a couple of issues with Time Machine backups during non-related activities. Prior to doing the upgrade to Yosemite, I forced a backup with the TC which completed successfully. I then turned off Time Machine. Then I did the Update process with the machine connected via my recently acquired Ethernet adapter. All this went fine. After the download and prior to doing the install, I dragged the dmg file to my desktop so it wouldn't auto delete and then _copied _the dmg to a drive connected via my USB hub attached to my TC. All ok to here, no issues Then did the update of the MBP to Yosemite, this also ran with no issues (backup still turned off). Sign in to iCloud all went fine too. Then i did the iTunes update, a nice new front end UI, long overdue though. Then I trashed the Yosemite dmg from the desktop so as not to have a further 5GB included in the backup when I had held over another copy of it independently. I then shut down iTunes in readiness for kicking off the backup. When I switched on TM, it commences by "Preparing Backup", I expected this to take a while and it did. A while later I got an error message saying backup drive too small for this backup. I was expecting an incremental backup not a full backup of the ~720GB of data I have all over again. I thought here we go again. I took a look in Finder at the Sparesebundle file and there was a 4.5GB sparsebundle file there and no sign of the previous ~630GB Mavericks based Sparesebundle. I probably did something wrong but wasn't too bothered as the Sparsebundle was only a month old having previously deleted the Sparesebundle and rebuilt from scratch just a month ago when I had the previous problem following a Dropbox/Backup clash I caused I am curious to know if there is anyone else who had a similar experience with the Yosemite backup or might have a clue as to what I did wrong. . By contrast my 11yo son, did his update (on his 2012,13" MBP non-retina) and then TM update was ~13GB without issue. Still a big backup. Regards Pete.
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