What size external hard drive needed for Time Machine?

Can someone offer advice? What size external hard drive do I need to back up my system with Time machine? Hard drive is 232 GB but I'm only using 40 GB of the 232.
Thanks.

beach bum51,
Hard drive space is cheap, so I'm going to recommend that you get something with at least 500 GBs capacity. 500 GBs would be twice the capacity of your internal, which is apparently the "recommended" size, so I have no hesitation recommending it. The larger the drive, the lower the cost per GB.
What's not so cheap is speed. You'll be happiest with a drive capable of using the fastest bus provided by your computer. If your iMac has a Firewire 800 port, you'll get the best experience from using that port, and a drive that will use Firewire 800 transfer speeds.
Scott

Similar Messages

Relative size of external hard drive needed for Time Machine

I have Time Machine up an running on an old 250Gb disk. My new iMac has a 500Gb disk, but lots of free space, so Time Machine is reporting adequate remaining space on the backup disk. Has anyone calculated the sort of ratio in disk sizes that will be necessary over time? For instance, with a 500Gb disk in the Mac, will a 500Gb external drive be sufficient for all time, or will it get full. Should be be considering doubling the external disk size to 1 Tb?
I need to replace the 250Gb drive and am wondering what size is optimum.

I've been seeing knowledgeable people writing that a good rule of thumb for "typical" home users is they should have a drive with a capacity of 3 - 4X their system's normal operating size...to maintain a full year's worth of Time Machine data before it starts scrolling off.
So I guess that means I should be looking at a 1TB drive for my iMac which currently has ~250GB of data on it. Time to review that Bare Feats 1TB drive shootout (http://www.barefeats.com/hard94.html).

External hard drive used for Time machine is full and having a hard time backing up. what should I do?

External hard drive used for Time Machine is full and having a hrad time backing up. What is my best option moving forward? NAS?

For All things Time Machine see Pondini's Excellent Infirmation here...
http://pondini.org/OSX/Home.html
Start with FAQs and Troubleshooting.

External hard drive setup for time machine reading as a virtual cd

Why is my MacBook Pro reading my external hard drive setup for time machine reading as a virtual cd?
Thanks

Hi Christian,
Is this something that has happened from the start? If so, I would reformat the disk and setup TM from scratch again.
Prepare the external HD by connecting to the Mac, open Disk Utility, select the manufacturer’s name of the external HD, select Partition and choose GUID Partition Table, format to Apple OS Extended (Journaled); quit Disk Utility.
Open System Preferences.
Click on Time Machine.
Click on “Select Disk.”
Click just to the left of "On" to turn TM on if it's not already on.
Click on the disk or partition you want to use.
Click on “Use for backup.”
Leave external HD connected, and TM will automatically do its thing.

What size HDD do you need for Time Machine is it the size of iMac HDD?

Ok, looking to buy iMac, to use Time machie do you need the same size HDD that is in your iMac? ie Im looking at getting the 250Gb iMac, so do I need a 250Gb external HDD to use time machine?
I plan to also get a NAS drive so can time machine be used with this or do you need n external HDD attached direct to the iMac all the time to use time machine?
cheers

the loc-man wrote:
so you can pick and choose what backup? eg Music, Pics, Docs, emails etc?
Yes you can choose everything or just parts.
does it compress stuff though to utilize the space better?
No, look here for more detail. http://www.apple.com/macosx/features/timemachine.html
its not like a ghost image?
Not that I know of.
so if the iMac had to be re-installed could you then reconnect the Time machine HDD and restore everything?
You could insert the Leopard disk and instead of doing a new install you could restore directly from the Time Machine Back Up. This depends on if you do a full back up or just parts of your system. Either way it is easy to recover your system using Time Machine.
Also if the external HDD is used for time machine is that all it can be used for? or can you also use it on other computers both Mac and PC?
It is best if you use Time Machine on a partition by itself. Then the other partition can be used for normal stuff.

On a 500G MBP running Lion what's the best size to partition a 2T WD external hard drive to for Time Machine? Thankse

Just picked up a 2T WD external HD for my new MBPro with 500 G drive. Looking to use part of the external drive for Time MAchine. Not sur if I should designate 1T of it or 750G. I'm running Lion. What's the best way to format the external drive. Disk Utility?
Thanks,
Dennis

Ask in Lion: TimeMachine / MacBook Pro even - this is workstation territory
I would not use the same drive for data and for backups.
If I had to, I'd make a partition large enough to boot your Mac from though, whether 50-500GB to clone your system.
You should still be able to use Lion's Recovery boot mode.
I don't think there really is much choice in what to format with, unless you want to spend over $100.

External Hard Drive only for Time Machine?

I just bought a 500GB external HD and just ordered Leopard. I'm wanting to use the hard drive for my iTunes library rather than keep it on the internal HD due to the size.
My question is, if I then use it for Time Machine, will it be only for TM or can I do both?
And if I can do both, will it erase what is currently on there while setting it up for TM?

Apple doesnt recommend it, but it shouldnt be any problem. Time Machine creates a backup directory in which it keeps all the backup info. As long as there's space you can use the drive for other items. I have an internal 500GB drive I use for backup, and I keep some large files on it. The problem will be sooner or later the drive will just fill up with backup info, and time machine at that point will dynamically erase the oldest backups but will not have space for storing other files. Basically dont rely on the drive to have space for storing extra stuff. Partitioning the thing will prevent this, but it will make your backup drive smaller.

Cleaning virus-infected files on external hard drive used for Time Machine

I am kinda reposting this with some extra explanation since I didn't really get any good respnses on my first post:
I am running McAfee VirusScan and it locates and cleans virus infected files just fine on my computer, but when it finds infected files on the external hard drive I use for Time Machine backups, it says "Repair Failed". Is there a way to clean infected files on my Time Machine backup drive?
I had found a virus in several documents on my Mac, which I cleaned, but it seemed to infect a bunch of the files located in Time Machine as well. I know these files shouldn't harm my Mac, but I still don't like having virus infected files. They seem to propagate and I don't want to give them to any of my Windows-using friends.

Hi,
Usually (but not always), virus-infected files aren't system-related, so if they cannot be repaired, there should be an option in VirusScan to delete them or quarantine them instead of repairing them. Assuming that you are archiving Mac-related files and not archives of Windows files, then it should certainly be safe to just have VirusScan delete or quarantine them. An alternative is that you could delete them manually. But before you do any of this, be sure to take a look at the filename and its location in the folder hierarchy to make sure that you aren't removing a file that's critical to the operation of some piece of software.
Hope this helps,
Ken

How do I password protect the external hard drive used for Time Machine backup

Can anyone help me to put password protection on the external hard drive I use to Time Machine backup my iMac internal hard drive? I use Snow Leopard 10.6

I think that was FileVault 1. Starting with Lion (10.7) Mac OS X uses FileVault 2, which is whole disk encryption.
Based on complaints seen in these forums, I would say FileVault 2's only complaint has been when people forget their password/encryption key (it seems an encrypted disk does prevent anyone without the password from accessing the data, including the real owner). Otherwise it does not seem to be causing any serious issues. Your Mileage may vary and objects are closer than they appear in your side view mirror (standard disclaimer). Of course this is all academic while you are using Snow Leopard (10.6).
There are other whole disk encryption packages available, such as PGP Whole Disk Encryption, HOWEVER, I would not advise it for your Mac OS X boot disk, as it has been known to be a problem when you try to install operating system updates or upgrade to a new version. NOTE: I have not seen PGP Whole Disk Encryption discussed much, ever since FileVault 2 came along.

External hard drive partition for Time Machine wont mount

I have an external HD that I've partitioned half for Time Machine, and half for external storage. Today the Time Machine partition wouldn't show up on the desktop. I checked Disk Utility and it recognizes both partitions, but the Time Machine partition is greyed out. When I selected it, in the stat list at the bottom it said "Mount Point: Not Mounted." I then clicked on "Mount" at the top, and after a bit a popup told me it couldn't mount and I should attempt to repar the disk. So I clicked "Repair Disk," and after a while, I finally got the message "Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files."
Why is only one partition affected? Can I reformat one petition but leave the other untouched? Are there any other options before I do this?
One other item that is probably related: I've been having an issue with a flash drive that seems to constantly unmount itself, giving me "error, disk ejected improperly" messages. Earlier today I believe I had the same thing with my external HD.

Why is only one partition affected?
The drive malfunction that caused the problem only affected that partition.
Can I reformat one petition but leave the other untouched?
Yes.
Are there any other options before I do this?
This is not an option, it's mandatory: start a new backup on another drive. The one you have has lost data once already. If it were mine, it would be in the recycling bin now. You need more than one backup to be safe anyway. Apparently you have no backups at all of the data on the other partition. That means you're going to lose that data, sooner or later.

How do I part ion an external hard drive used for time machine?

I have a Seagate 1.5 T external harddrive I'm using for Time Machine. I would like to partition it so I can store other files and photos on it. How do I do it??
Thanks,
JD

In Disk Utility
http://docs.info.apple.com/article.html?path=Mac/10.7/en/mchlp1725.html
Message was edited by: b j t

What size external hard drive do i need for Time Machine

What size external hard drive should I get to be my Time Machine backup? My iMac is 1TB. (also, I have MBP that is 250gb and will need one for it as well)
Thank you.

It is better to buy an external drive that has 3 times the storage capacity
as of the computer's internal HD.
Best.

What size external hard drive do i need to backup my macbook pro?

I know I need to backup my computer, especially since I have been experiencing some problems with it and will need to take it into a store to get looked at, but I do not know what size external hard drive I need to back my computer on.

Drives are so low in cost today, go for something that will meet your needs for a while...if you are going to use Time Machine, get a drive large enough that you can have a partition double the size of the internal drive for TM backups, and a partition you can use for more storage and work space.
A decent drive like the Mercury Elite Pro 2 TB drive OWC sells goes for less than $200 (US) now. Has a fast interface and is easy to setup.

What size external hard drive should I purchase

What size external hard drive should I purchase? I'm not tech savvy, so please speak slowly. I'm looking at OWC Mini Stack Classic to match my older Mac Mini. Do I need 500 GB, 1 TB or more? Plus, I have to add memory to upgrade to Snow Leopard. How much memory do I need and should I have an expert install it ?
Mac OSX version 10.5.8
Mac mini 3.1
Processor 2 GHz Intel Core 2 Duo
Memory 2GB 1067 MHz DDR3
1 Processor
2 Cores
L2 Cache 3MB
Memory 2GB
BUS Speed 1.07 GHz
Boot ROM Version MM3.1.0081.B06
SMC version 1.35f0
Hard Drive
Format MAC OS Extended
Capacity 297.77 GB
Available 238.69 GB
Used 59.08 GB on disk

Good points raised by all.
In my mini configs - both older and newer flatter model - I have kept their ministack external drive on top of the mini; with 3 or 4 little rubber feet added to the mini's base to give it a bit more elevation from the surface they are sitting on and a bit better chance to breathe. I'm not impressed by the very small air intakes on the bottom and the hot air that often comes out the back or how warm the case feels. Especially in the heat of summer.
I do turn the ministacks on/off as needed (primarily for backups once a week) as they're not entirely quiet and sometimes seem to have a low hum vibration. Nothing crazy. I just like it as dead quiet as possible sometimes. Plus the fan does not turn off even if the mini and ministack drive have shut down. The newer wide & slim model does seem a bit quieter than the older model.
Check through system profiler to see if your system has 2x1GB or 1x2GB. Most likely it is 2x1GB and you'd need to remove both to double your ram. On the off chance it has a free slot; a single 2GB stick would get you to 4GB. Check on the cost difference between the 2x2GB kit and a 2x4GB kit. I have an older core duo mini that functions fine with 2x2GB of RAM and 10.6.8. But, if you plan to continue to use the mini for several more years as a primary machine including upgrading the OS to Yosemite; it might not be a bad idea to just max it to 2x4 8GB. Yosemite really likes RAM to maximize performance.
Along the lines of keeping the same mini and doing upgrades. The biggest speed improvements are made by replacing the original internal hard drive with a flash drive. Of course this is a more technical upgrade, you really need to take the mini apart more and you have to weigh the cost of the upgrades and possibly paying somebody to do them; vs the cost of a newer system which would have a significantly faster processor and other improvements.

How do you remove back up data from the memory storage? my storage data states that i have over 80gb of data used for back ups and i dont know why as i use a external hard drive as a time machine .now my 250gb flash storage is nearly full

how do you remove back up data from the memory storage? my storage data states that i have over 80gb of data used for back ups and i dont know why as i use a external hard drive as a time machine .now my 250gb flash storage is nearly full.. HELP!

When Time Machine backs up a portable Mac, some of the free space will be used to make local snapshots, which are backup copies of recently deleted files. The space occupied by local snapshots is reported as available by the Finder, and should be considered as such. In the Storage display of System Information, local snapshots are shown as Backups. The snapshots are automatically deleted when they expire or when free space falls below a certain level. You ordinarily don't need to, and should not, delete local snapshots yourself. If you followed bad advice to disable local snapshots by running a shell command, you may have ended up with a lot of data in the Other category. Ask for instructions in that case.
See this support article for some simple ways to free up storage space.

What size external hard drive needed for Time Machine?

Similar Messages

Maybe you are looking for