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Time machine not seeing shared drive

for years I have been backing up 3 macbook pros over wifi to a time machine drive connected via USB to a Mac mini. the mini is connected to the router via ethernet. Router is a fios gateway router.

 

the external drive has always immediately appeared in the time machine prefs on the MBPs for selection.

 

About a week ago backups stopped. the drive no longer shows in the TM prefs. It still shows in finder and can be mounted remotely with no problems.

 

The only thing i did around that time that i can think of is trying to set up a VPN server on the mini with macos server and playing around with port forwarding on the router. I gave up on that after a few days.

 

Now, macos server app is not running. I have reset the router to defaults settings. I have reformatted the TM drive. I have reinstalled macOS on the mini. none of it helps.

 

I have also connected the TM drive to one of the MBPs, shared it, and as before it can be seen and mounted in the other macs, but wont appear in TM prefs. I can successfully backup to the disk from any of the macs if i directly connect it to them.

 

So, I am at a complete loss. This system has worked for years. The problem doesn't seem to be the router, as it is back to default settings. It doesn't seem to be the mini, as the problem persists even when i connect and share the drive from a MBP (if it had worked from the MBP, i would have done a clean install of macOS on the mini). and it doesn't seem to be the drive as the problem persists after reformatting it.

 

Does anyone have any suggestions? I hope i am missing something obvious here.

Hello nesss01, 

Thank you for using Apple Support Communities!

I understand from your post that your Macs are not automatically backing up as they previously have been. Remounting the network disk may help resolve a situation like this as once it has been selected it should automatically backup. 

Backup disks you can use with Time Machine - Apple Support

Use a network-based disk

If your backup disk is on a network, the network server must use Apple File Protocol (AFP) file sharing. Both your Mac and the networked backup disk should have OS X v10.5.6 or later. The AFP disk must also be "mounted" (available to your Mac) when you set it as your backup disk in Time Machine preferences.

  1. From the Finder, choose Go > Connect to Server.
  2. Enter the server address, or your AirPort Extreme Base Station's LAN IP address (by default 10.0.1.1).
  3. Enter the username and password required to access the network disk(s).
  4. Select the desired disk(s) from the available volumes.
  5. Select the volume from Time Machine. 

After you select the network disk in Time Machine preferences as a backup disk, Time Machine automatically connects to it when it’s time to backup or restore your data. 

Best Regards.

最後更新：2017-10-03 09:11:09

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