Time Machine: "Disk Not Recommended for Backups"

Time Capsule uses a deprecated format for the internal drives, and that's what is no longer supported by Apple starting with macOS 26. Also, it has now been over 7 years since the Time Capsule was last sold by Apple, and that means the product is now considered 'obsolete'.

The simplest method to continue using Apple’s Time Machine to back up your Mac(s) is to buy an external drive and connect it to the Mac(s) regularly to back them up (or leave the drive connected to a desktop Mac). External storage is relatively inexpensive, a 1 TB SSD or a 2-4 TB HDD can be purchased for <$100. 

To back up your Macs over WiFi, you will need a network attached storage (NAS) device – essentially a box for hard disks that connects to your network. Ideally, choose one that offers turnkey support for Time Machine out of the box, both Synology (setup instructions) and QNAP (setup instructions) do so. Personally, I use a Synology DS223j with a pair of 10 TB HDDs installed to back up 5 Macs in the house with Time Machine (separate shared folder for each Mac sized at ~2.5x the internal storage), with the remaining space used as general file storage for anyone in the house.

neuroanatomist wrote:

Time Capsule uses a deprecated format for the internal drives,…

Systems running Time Machine server can run whatever local file system, so long as it can serve file data SMB traffic.

It’s the AFP protocol — the Apple analog to SMB — that is ending support.

The similar-but-different APFS requirement does exist for Time Machine and local directly-connected storage, but this is APFS and not AFP. APFS is not a requirement for NAS access.

Apple has been supporting the replacement for some years now, with Time Machine server and SMB support.

I've been replacing AirPort Time Capsule configurations for a while, due to device age, failures, and capacity issues.

macOS 26 is dropping AFP support, which ends the usefulness of AirPort Time Capsule.

Two of the various previous discussions of this topic, with details and considerations and options:

• Time Machine will no longer support Time … - Apple Community

• Apple will stop supporting the AirPort Ti… - Apple Community

If you have questions after reading that, ask away.

<< Time Capsule uses a deprecated format for the internal drives, and that's what is no longer supported by Apple starting with macOS 26. >>

Those minute details are not quite right.

What will be discontinued is the Apple File Protocol, which as actually a Networking protocol for talking to the Time Capsule.

The drive formats are typically MacOS Extended, HFS+ and will still be supported. So the drive could be removed, placed in an adapter or dock, and read on a more modern Mac directly without issue.

But without Apple File Protocol, you will not be able to REACH the Time Capsule drive.

Additional information:

Every kind of Server (even another Mac when used as a Shared Backup Destination [requires macOS High Sierra 10.13 or later]) stores Time Machine backups inside a sparse bundle disk image -- a drive inside an expandable file. This means the actual File formats used natively on the NAS/Server drive are a "Don't care" as long as there is a way to create a sparse bundle disk image file.

Grant Bennet-Alder wrote:

Those minute details are not quite right.

What will be discontinued is the Apple File Protocol, which as actually a Networking protocol for talking to the Time Capsule.The drive formats are typically MacOS Extended, HFS+ and will still be supported. So the drive could be removed, placed in an adapter or dock, and read on a more modern Mac directly without issue.

Thanks!