But before I could do that, there were several hurdles to overcome. The core of my plan was therefore to get Time Machine to back up to an HFS+ sparse bundle on an APFS volume.
One way of hosting a different file system is to use a disk image, in this case a sparse bundle, which has from the first release of Time Machine been used to store backups on shared and networked storage. It would be far more convenient for the whole of that SSD to be in APFS, but because Time Machine backups still rely on directory hard links, which aren’t available in APFS, HFS+ it must remain. But with SSDs the situation is different: for instance, one of my Time Machine backup disks is a 2 TB SSD, on which those backups occupy less than 200 GB. Indeed, because of the poor performance of APFS on hard disks, I’m sure that you’d much prefer to. If you’re still backing up to hard disk, then there’s no problem with continuing to use HFS+. In this article I explain how to avoid that, and keep your Time Machine backups on disks formatted using APFS instead.
It’s then a pain having to keep two of those in HFS+ format to cater for Time Machine backups. Like many Mac users, I’ve now phased out the use of hard disks, and although I still have plenty around, all my everyday storage is on SSD.
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