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Mountain Lion has a very useful feature where it can alternate between multiple backup destinations. I use this to back up to both a network share at home and an external drive I keep offsite. Because I only have physical access to the offsite drive occasionally, I don't back up to it often.

After 10 days, OS X gives me a message around the same time each day, such as: Time Machine hasn't backed up your computer in 120 days

Time Machine is still backing up successfully to the network share every hour, so this message is unnecessary (and the second sentence is incorrect).

I like being able to see when the last backup was completed, so I'd prefer not to remove the disk from Time Machine's destination list entirely.

I have a partial solution using TimeMachineEditor which causes more noise when it triggers a manual backup and the drive isn't available. I'm still interested in other possible solutions, ideally if there's any way to directly change the number of days before Time Machine generates this warning (like a defaults write command).

Is there any way to disable or delay this message? Ideally I would be able to set it to a longer period of time, so it could remind me to go do an offsite backup every month or so.

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I'm in a similar situation. This message get's really irritating after a while :( –  gentmatt Mar 6 '13 at 7:13
    
Even worse - it interrupts Keynote presentations! –  Matt B. May 17 '13 at 16:39

1 Answer 1

Perhaps TimeMachineScheduler or TimeMachineEditor can help.

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Interesting idea. TimeMachineScheduler seemed to be unable to trigger a backup at all - not sure whether that's because it doesn't support multiple backup destinations or because the one I can use right now is a network share. I'm watching TimeMachineEditor now to see if it works. –  gabedwrds Oct 28 '12 at 3:54
    
TimeMachineEditor is triggering backups successfully, on the downside it only does so for the first disk unlike the default behaviour which rotates through all available disks. –  gabedwrds Oct 28 '12 at 7:40
    
Correction: It triggers a backup for the last drive I backed up to, and complains with a dialog box if the drive isn't available. No, that won't do... :/ –  gabedwrds Oct 28 '12 at 9:52

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