In Disk Utility, add one or more AFPS volumes to the same container that includes the Time Machine volume, and set a Reserve Size for each (see below for step-by-step instructions).Create an APFS Time Machine volume as normal.You could reserve 100 GB so that no other container deprives your backup space of a minimum of 100 GB and you could also or just add a Quota of 500 GB to make sure your Time Machine volume never consumes more than 500 GB of space from the shared container. Quota Size: The optional quota size limits how much storage the volume can allocate.Reserve Size: The optional reserve size ensures that the amount of storage remains available for this volume.If you want to manually manage APFS volume allocation, click Size Options, enter values in the fields, then click OK. In the above linked pay attention to the two fields - reserve and quota: The two volumes then share the available space. If you want to store files other than the Time Machine backup on the same physical device, use Disk Utility to create an additional APFS volume on the disk. Note: The entire APFS disk is reserved for Time Machine backups. #How large disk space for mac time machine how to#With macOS 11 you are correct that APFS is preferred and Apple explicitly shows how to split an APFS disk so that not all the disk is used for backup space. The limitation is that it's impossible, to my knowledge, to modify the quota without suppress and re-create the TM volume.Īpple still supports HFS+ Destination disks so the old method will still work on Big Sur. If there is no volume selected for Time Machine saves, immediately TM proposes to use this volume.Īfter the first save (small because i'm on a test Big Sur install) the result is : xxxxxxx ~ % diskutil ap list disk4Ĭapacity In Use By Volumes: 6738415616 B (6.7 GB) (8.4% used)Ĭapacity Not Allocated: 73261584384 B (73.3 GB) (91.6% free)Ĭapacity Quota: 20000002048 B (20.0 GB) (33.1% reached) Preparing to add APFS Volume to APFS Container disk4Ĭapacity In Use By Volumes: 122675200 B (122.7 MB) (0.2% used)Ĭapacity Not Allocated: 79877324800 B (79.9 GB) (99.8% free) Will export new APFS (Case-sensitive) Volume "Time_Machine_BS" from APFS Container Reference disk4 with a 20000000000-byte quota role T indicate that the volume is a "Backup TM" xxxxxxx ~ % diskutil ap addvolume disk4 APFSX Time_Machine_BS -quota 20g -role T quota 20g limits growth to 20 Go for this volume But the diskutil command by the terminal application do it very well.įor example, i've a Container of 80 Go and i want create a Time Machine volume how will not exceed 20 Go : xxxxxxx ~ % diskutil ap list disk4 Yes it's possible, but not by the Disk Utility, because you can't set a role to your Volume by this way.
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