HT201250 Does time machine compress the data in backup?

I have got to replace my internal hard drive so have to back up just everything to an ext drive.
When I use 'time machine' to back up to an external disk, does that disk have to be larger than the file size on my iMac?
Does Time machine compress the data?( eg will 1TB fit on a 500 gig external drive?)
Thanks

No, Time Machine doesn't compress the data. I recently started a new TIme Machine backup, and the first backup required the same amount of space as it was backing up (actually a little bit more during the backup process).

Similar Messages

  • Does Time Machine Compress My Data?

    Can I use a 160Gb external drive to back up more than 160Gb of data on my computer? Does Time Machine compress anything, or would I have to decide what to back up and what not to?

    Time Machine doesn't compress anything.  It is better to have a destination Time Machine hard drive that is twice the capacity of the source.  Compression can lead to data corruption, or unrecoverability because the data compression engine may not have a compatible decompressor at the time of recovery.

  • HT201250 Does Time Machine delete files in back-ups that are deleted on my Mac?

    Does Time Machine delete files in back-ups that are deleted on my Mac?  IOW....if I need to restore a whole back-up, I don't want to restore previously deleted files.

    Does Time Machine delete files in back-ups that are deleted on my Mac?
    Not immediately. When space starts to get tight, Time Machine will start to delete the oldest file(s) to make more room, but this won't occur for some time.
    if I need to restore a whole back-up, I don't want to restore previously deleted files.
    You won't if you choose to restore from a backup that occurred after the date that you deleted the file.
    If you absolutely do not want to keep the file in your Time Machine backups at all, you do have the option to go into Time Machine, find the file, and manually delete all versions of the file from past dates.

  • How does time machine use the external disk space??

    does time machine back up only the changed or new stuff or does it back up everything?  does this mean that if on "day one" it backed up 600 gb worth of data, the next back up on "day 2" would be 600gb+a few more things, or would it be 600gb+600gb+the few more things?  Does it back up "day one" in a whole package and "day two" in another package, or does it back up "day one", plus only the different things made from "day one" to "day two""?
    similarly, does it keep stuff from the first back up ever, plus anything new or modified in the following back ups, then when it is full, does it let just the oldest files drop off?  or does it drop off everything from the initial backup?  that is, if I had 20mb of changes would it erase only 20mb of data to make the new data fit, or would it erase all 600gb from say "day one"?
    thanks for the answer!
    iMac, Mac OS X (10.6.8)
    <Email Edited by Host>

    See Pondini's TM FAQs for starters.

  • HT201250 Does Time Machine backup and restore Bootcamp?

    I am replacing defective hard drive in an iMac that I primarily use as a pc under Bootcamp.  I have to find some way to clone and restore the bootcamp partition.  I was told today by a Genius at the Apple store that I should buy a 2 TB external (which I did for $150)  and run Time Machine.  He assured me that my bootcamp partition would be backed up along with the entire mac partition and that I would be able to restore everything perfectly on the new hd. Now that I am home and continuing my research, I can't find anywhere that says it will work.  Documentation on Time Machine fails to  mention bootcamp.  So, does Time Machine backup and restore bootcamp or not?  And will it be bootable after the restore?  Help!

    I think you've got it! I have never used WinClone so I cannot attest to how well it will work, but it's pretty much all lthere is. You will have to create a new Boot Camp partition on the new drive, and it should be the same size as the partition you cloned.
    Be sure you prep the new hard drive:
    Drive Preparation
    1. Boot from your Snow Leopard Installer Disc. After the installer loads select your language and click on the Continue button.  When the menu bar appears select Disk Utility from the Utilities menu.
    2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, click on the Partition tab in the DU main window.
    3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
    4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
    5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
    6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
    7. Quit DU upon completion and return to the installer. Now install Snow Leopard or restore from your Time Machine backup.

  • Does Time Machine provide the same capability as Windows Restore?

    Hi - I am exploring backup and restore options for the MAC.  I am most familiar with Windows and Windows Restore, where you can restore a Win machine back to the same state it was at a particular point in time ( including the OS and system files. Does Time Machine provide this same capability?  Thanks in advance for your time.

    Yes, it provides the ability to recover personal documents only or a complete snapshot of the operating system with applications, files and settings present during the time that snapshot was taken.
    More info:
    Mac Basics: Time Machine backs up your Mac

  • HT201250 Does Time Machine back up e-mails from Mail?

    Does Time Machine back up e-mails from Mail?

    Make Mail the foremost application and then enter Time Machine.

  • Does time machine back up data for all users on a shared computer?

    If I set up Time Machine backups from my own login, does this mean that all data on the computer is backed up, including that for other users?

    Good question.. yes, it should.
    http://pondini.org/TM/2.html

  • HT201250 Does time machine work with iCloud?

    I'm new to Apple - not sure if Time Machine can work with iCloud instead of an external HDD. It would seem that iCloud would be the best place to backup to since it is available - just get on the internet and its there.

    TIme Machine doesn't work with iCloud.
    OS X Mountain Lion: Disks you can use with Time Machine
    The backup volume has to be large enough to hold at least one copy of all the data you want to back up. The more space it has, the longer your backup history will be. It does not have to be any particluar multiple of the size of the volume(s) you back up.

  • The time machine deleted the data I had in my external hard drive

    I had achived data from another computer (windows platform) and I decided to back up my data of my mac book from using time machine. After I did that I lost all the data I had before.
    My question now is how do I restore the old data back I had in it?

    Hey guys,
    Recently I saw one of turingtest2 posts regarding iPod and it was interesting.
    turingtest2 I believe you are more confident than me and I would like to know if you could give me any idea to solve my above problem if you see this message.
    Cheers mate,

  • Does Time Machine utilize the password I created in Disk Utility?

    Using Disk Utility, I created a volume (confidential.dmg) which contains personal information. Within Disk Utility, I also elected to require a password to open this volume.
    Using Time Machine, I back-up the entire contents of my Mac to a fire wire drive.
    If someone had possession of my fire wire drive, would they have to know the password I created in order to open confidential.dmg? Or are there other ways someone else could access the contents of confidential.dmg?
    Thanks

    Time Machine will just back up the encrypted disk image so yes, if somebody had access to your Time Machine they'd still need to know the password if they wanted to open it.

  • Why does time machine show the backup failed

    The time machine icon in the menu bar keeps showing up with a "!" in the middle of it, which is suppose to mean the back up failed.
    Yet when I go to System Preference, it shows the backup succeeded.
    The menu bar shows the last successful back up was on Sept 13.
    System Preferences shows the last successful backup was an hour ago.  (15 Sept.)
    How do I get these two to agree with each other?
    Rebooting the computer doesn't seem to help.
    I'm running 10.9.4 now.

    LonerT:
    Thanks for looking at the HomeSharing problem
    I have three discussions open that are related.  The first one shows that the ATV appears to open the extra DAAP connections, which in turn appears to be related to Homesharing problem.
    Airport opens multiple DAAP connections
    Numerous ATV DAAP ports to MacBook Pro
    Cannot turn off Homesharing to AppleTV: IPv6 connections remain
    This one (not mine) points at the Bonjour Sleep Proxy Service as being involved in the DAAP problem.
    DHCP conflicts between AppleTV and Airport Extreme repeater
    And this is the "other side" of the problem, which I have also experienced
    Apple TV homesharing keeps dropping out ...
    I note that my AppleTV started out with a DHCP address of 10.0.1.16, it jumped to 10.0.1.20 and then migrated up, one address at a time, to 10.0.1.25.
    Given the number of systems I have on my subnet, if they are handed out in order, and given that I just moved from 192.168.1.0/24 private space, the highest address should be around 12. 
    I have two Apple TVs.  One on Wireless remote from the ATX and connected to an Airport Express and one connected via ethernet directly to the AEX.  I don't use the remote one.  It should not have been turned on (activated) for at least two weeks, yet the AEX is still sending out ARP requests for the last IP address that it had and my laptop still associates the AEX MAC with the last address assigned to the remote ATV.

  • Time Machine Displays Wrong Date of Backup

    My computer shows the correct date of November 9, 2008, but the Time Machine Backup displays September 14. Can this be fixed?

    Actually, this does not need to be "Fixed". You are probably seeing the date the backup files were first created. Was that the date of your first backup? That is OK, +DO NOT+ change anything on the backup drive directly. If you need to delete/modify files that have been backed up, do so through the Time Machine "time travel" interface.
    If you click the Time Machine Dock icon (round green clock icon), you will enter the Time Machine interface and see all the backups that have taken place since you began.
    Cheers!

  • Why does time machine make a second/different backup after new installing a hard drive?

    Hi all,
    Long time reader, first time poster...
    after having to install a new hard drive on my MacBook Pro, the new Time Machine backups are not recognising the original/older backups on the external hard drive connected via network router and has created a new/second backup caller 'xxx Mac Book Pro 1' instead of updating/reading the orginal 'xxx Mac Book Pro backup'?
    Does anyone know why it did this? and more importantly how do i make it recgonise the original and stop making the secondary copy?
    Thanks!

    Hi gb69,
    If you are having issues with Time Machine backups after a recent hardware change, you may find the following article helpful:
    Time Machine: Troubleshooting backup issues
    http://support.apple.com/kb/ht3275
    Regards,
    - Brenden

  • Does Time Machine conflict with Crashplan offline backup for Macs?

    Hello,
    Has anyone experienced Time Machine on Macs conflicting with Crashplan offline backup for Macs?  I would like to run both on my iMac... Time Machine for local backup to my E-drive and Crashplan for a backup to their servers.
    Thanks

    This article may be of help to you:
    http://support.crashplan.com/doku.php/articles/time_machine
    I also want to point out that CrashPlan also supports local backup.

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