Time Machine

This is happening to me too, and has been for a few months although I never do backups on battery power. I get the prompt that it's been 10 days since last backup, plug in my external drive that I exclusively use for backups and Time Machine runs automatically. And then 10 days later I get a prompt saying the backup wasn't complete because I was running on battery, which I wasn't. I am running Ventura 13.1 on my M2 MacBook Pro. So should I just ignore the prompt?

The alert says "The most recent backup did not complete because your computer was running on battery" but it was plugged in to power. This has happened several times.

Go to

System Setting->Time Machine->Options

Change back up frequency to Manually

Apple Support advanced me to the senior technical support team and, while they still aren't entirely sure, we're testing a possible fix: If you are backing up to an external hard drive, try removing the timed backups (i.e. every X hours) setting and select the option to backup manually. Her thinking was that the message may be coming through because it's *trying* to back up but the drive isn't plugged in. I'll let you know in 10 days if it worked!

on my Mac book Air M2 and i have a window :

No Backups for 72 Days

The most recent backup did not complete because your computer was running on battery.



The exact same thing has happened to me twice this past week - both times my MacBook Air (8 GB M1 using Ventura 13.1) was properly plugged into power and charging. Just woke up to this same notification again this morning so I did double-check my power supply - and I see in the upper right corner of my laptop the "lightning bolt" is showing on the "battery life" icon, so I know it's plugged in right now and charging and the battery is at 100% - so its got nothing to do with power. Time Machine is doing automatic hourly backups properly so it's just a glitch I suppose?

What operating system is installed on the Mac that you are using?

This is happening to me too. Were you able to do anything to stop the alerts from happening? It seems my backups are valid as well, but I continue to receive these scary alerts.

I get this pop-up too. My routine is to plug an external drive into my MacBook Pro every few days to back up. The way to avoid the pop-up (for me) is to set the Time Machine backup to Manual (System Settings >General>Time Machine>Options). The default seems to be Hourly, but my external drive for Time Machine is not usually connected, so it will usually fail, unless set to Manual.

Got it, thanks.

Thanks for your quick reply! That may be what it was...I just backed up manually and it seemed to have worked without issue. I guess I'll see in 10 days as well hahahaha

Good luck!