Time Machine

Discussion in 'Mac Basics and Help' started by HoddzDJ, Jul 6, 2013.

  1. HoddzDJ macrumors member

    Sep 1, 2011
    England, UK
    Hi all,

    Just a quick question about Time Machine really. I have made the initial backup and also restored everything when I did a HDD swap on my MacBook Pro. I am now wondering a few things about Time Machine.

    With regards to the Hourly backups, is a whole new backup made every hour? If that's the case it seems a bit strange to backup everything again and use up all that space. Same really for daily and weekly backups. What data is in each backup.

    Is there a way to schedule the daily backups to be at a certain time, like when I'm not using the machine?

    Cheers in advance for any guidance!
  2. Jacquesvw macrumors regular

    Sep 12, 2012
    It's only an incremental backup every hour. So only the things that changed will be backed up after the first full backup.

    The size of each hourly backup will depend on how many things changed since the last backup. If nothing changed then nothing will be backed up other than a few kb of system data. If allot of stuff changed the backup will be bigger.

    Avoid making backups of large files that change often like VMWare Fusion virtual machines. You can exclude any folders you don't want to include in the backup.

    Hourly is perfect for most people.
  3. HoddzDJ thread starter macrumors member

    Sep 1, 2011
    England, UK
    I thought that would be the way it would work, thanks for the reply. I'm assuming it's the same for the daily backups?
  4. Bear macrumors G3

    Jul 23, 2002
    Sol III - Terra
    Yes, every backup after the initial backup is an incremental. The daily backup is just the first hourly backup of the day.
  5. ChrisA macrumors G4

    Jan 5, 2006
    Redondo Beach, California
    Only the data that actually changed is copied to the TM disk. They use some "magic" involving links (aka "aliases") to make it look like a full backup, but only the changed files are copied.

    THere really is not point in doing daily or weekly backups when you already are doing them hourly..

    If you want better backups them use some other system in ADDITION to TM. Like for example rotaing a pair of backup disk to an off site location.
  6. moataz83 macrumors newbie

    Jun 29, 2012
    Saudi Arabia
    Thanks for the valuable info. I'm just wondering if snapshots taken for the system requires the external backup drive plugged in all the time, after the initial backup.

    Because when I checked my time machine I found out that snapshots stopped since the last time I did a back up to the external drive!!!

    thanks for the comments
  7. Jacquesvw macrumors regular

    Sep 12, 2012
    Time Machine doesn't require the backup hard drive to be plugged in all the time and it will make a backup automatically once you connect the hard drive to the computer again.

    However, if you don't have the hdd connected to the computer it is pretty much useless having time machine in the first place because the point is to have the hourly backups incase you need them. :D

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