MacOS – Is it possible to limit the size of an APFS volume

apfsdisk-utilitydisk-volumemacostime-machine

My understanding is that with APFS, volumes exist inside containers, and the volumes all grow as much as needed, as long as there is space in the container.

But I want to limit the space for the volumes. I have a 2TB disk with two volumes – one for Time Machine and one for general storage. I don't want the Time Machine volume to take the entire physical disk. Sadly, there is no way (in macOS 11 Big Sur) to delete Time Machine snapshots, so I need to limit its space by limiting the size of the volume.

Best Answer

  • When creating an APFS volume, you can set a quota. In Disk Utility, in the sheet to create a new volume, choose Size Options and set a Quota Size.

    The optional quota size limits how much storage this volume can allocate.

    This can't be added or changed for an existing volume.