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Time Machine's Warning - Identity of the backup disk changed

Good evening to everyone,

today I've got this pop-up window from Time Machine:

Anybody knows what does it mean???

Of course I have not erased or replaced the disk. So mainly I'm asking, do I have to worry that really "someone may be trying to trick my computer into backing up to the wrong disk?" If so, one should have got access to my Time Capsule's Wi-Fi, but I'd say I'm using pretty strong WPA2 key also I have checked Wireless Clients list for unknown hosts, I haven't seen any, I can easily identify all of them.

Thanks in advance for help, some info or explanation, have good evening everyone,

Manoli

iMac with Retina 5K display, macOS High Sierra (10.13.3), iMac17,1 Fusion Drive

Posted on Mar 9, 2018 4:03 PM

Best reply

John Galt

Level 10

141,444 points

Posted on Mar 11, 2018 4:41 PM

That message will occur for a number of legitimate and mundane reasons. For example, a change in your network configuration, or another disk with the same name as the TM's backup disk was connected to your Mac (macOS has to assign new identities to keep them separate) are two that come to mind. The same message will occur if you were to delete the sparsebundle disk image on the Time Capsule, for whatever reason you might have wanted to do that.

If you are certain that no one tampered with your Time Capsule, then select Use This Disk.
If you are not certain, select Don't Back Up. Then, use Time Machine's Preferences and remove it. You can re-select that same backup disk again and backups will continue as they always have.

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Time Machine's Warning - Identity of the backup disk changed

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