Hello Peter, I’m not sure if I understand your Time Machine Backup of these two Photos Library’s?
WARNING: If a Photos library is located on an external drive, don’t use Time Machine to store a backup on that external drive. The permissions for your Photos library may conflict with those for the Time Machine backup. <https://support.apple.com/en-au/guide/photos/back-up-the-photos-library-pht6d60d10f/mac <https://support.apple.com/en-au/guide/photos/back-up-the-photos-library-pht6d60d10f/mac>> <https://support.apple.com/en-au/HT201517 <https://support.apple.com/en-au/HT201517>> Cheers, Ronni 13-inch MacBook Air (April 2014) 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz 8GB 1600MHz LPDDR3 SDRAM 512GB PCIe-based Flash Storage macOS High Sierra 10.13.6 > On 10 Feb 2019, at 10:47 am, Peter Crisp <[email protected]> wrote: > > HI, during Saturday i was consolidating the photos back up for my mother in > law (she has no computer) using my wife’s MacBook Pro. My wife has her Photos > library on an exclusive Photos only external 1TB drive. So I created a second > library “Carol” on the external drive to import photos for my mother in law > alongside the existing System library (420GB) for Jo. This import all went > very successfully but the next time a TM backup came around, as expected it > recognised the new library (~4GB) but the backup was ~460GB in size. Given > that the original library was unchanged and nothing in particular was changed > on the main SSD, why would TM decide the entire external drive plus other > material it seems, needed backing up again. I connected it to the Ethernet to > speed this process which finished during the night but I am puzzled why TM > decided to apparently update such a large quantity of data. My TC 3TB drive > is now down to 1.2TB remaining which is still plenty, but has copped 455GB it > didn’t need to and reduced my balance unnecessarily. > > Any clues why this would happen and how can I undo this other than blowing > away the whole backup file and redoing a full new backup? > > Regards > > > Pete
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