How much to partition on External HD for Time Machine?

Hi- I have an 80GB MacBook. I have a new External HD that has 500GB. How much space should I partition so that I can run Time Machine? WIll 100GB do the trick,or should I use more? Thanks for your advice. -Tim

JG!
Whew, am I blushing! I totally missed the FAQ-I just came to the forums and started searching for the answer and just blew by the FAQ. My aplogies. Thanks for directing me that way. I appreciate it.
pat

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Partition an External Drive for Time Machine?

I am new to the Mac world. I have a new iMac with a 1TB hard drive. I have a 2TB external USB hard drive I've plugged in and started using with Time Machine to backup up my Mac. But I'm thinking I'm wasting a lot of hard drive space which I could use for something else. Can I partition the external hard drive say into two 1TB partitions and use one for Time Machine and one for something else? If so, can I do it now that Time Machine thinks it has all 2TB? Or do I have to start from scratch? Thanks!

+Can I partition the external hard drive say into two 1TB partitions and use one for Time Machine and one for something else?+
You can, but it's not advisable. How are you going to back up the data on the other partition? If your internal drive is 1 TB, then 2 TB is about the right size for a TM backup volume.
If you place any value on your data, hard drives are cheap. Just get another one.

How much Minimum Disk Space is Required for Time Machine?

Are there any recommendations from Apple for the size of external hard drive for Time Machine?
Also, is there any formula for the amount of hard drive space = how any days, months, or years of backup available?
Sorry about the poorly worded question.

Size of HD = IBS + [30*DCD + 487*DCD]NM
or
Size of HD = IBS + 365NMDCD
where
IBS = Initial Backup Size (GBs)
NM = Number of Months wanted before HD fills
DCD = Daily Churn Data in GBs
So lets say
IBS=160 GB
NM=24 (2 years wanted before having to worry about disk full)
DCD=0.05 GB of daily churned data on average (50 MB of changed and new data)
Size of HD = 160 + 365240.05 = 598 GB
If you wanted just NM = 12 then the HD size should be around 350 to 400 GB
Much depends on how many months you want to go before being bothered with disk full and how much average daily data churn you have.
Note that TM will make much effort to clean up old data that can be safely deleted before giving up when disk becomes full. It will also provide you with the opportunity to clean up old backups yourself to free up space.
Of course you can always re-format the TM backup HD and start over again but you obviously lose your TM backup history. You can also to decide you can delete the oldest 6 months of data and keep the more recent history to continue on with thr freed up disk space.

How do I reformat my external drive for Time Machine?

I think I might have messed up My Passport (external hard drive) when I disconnected my iMac to take it to the Apple Store to have the screen repaired (was replaced). I turned Time Machine off before I disconnected the external hard drive but didn't eject it. I reconnected everything Monday morning and it was backing up fine until this afternoon but suddenly stopped and gave me warning messages about it not being able to back up. The message directed me to Repair Disk which I tried but that didn't work. and I was "told" to reformat the drive. But when I reconnect it to my mac, the mac doesn't recognize that its there. I don't know if its worth trying to fix, or if I should just get a new one. (I have an on line back up service so all my data is safe and backed up elsewhere). I've only had the drive for maybe 6 mts, or a little longer and I know it was far from full. I have Time Machine turned off now and the drive disconnected . Is it worth repairing. If there is something wrong with it a new one might make more sense. I hope I have explained this okay. Thanks for any suggestions. It is a Western Digital external drive.
laverne's mom

WD drives are not all that reliable according to some reports going around.
And BUS powered drives are not good choices for backups if it's drawing too much current, Apple can cut if off in a update, use self powered drives instead.
You can use the drive, but as a transport drive, not as a vital backup.
TM drive isn't quite as good as a backup as it could be, and online storage is slow to upload and can be compromised or lost (it's happened before) so you should diversify more with clones and storage drives in addition to TM drives.
Read my backup, bootable clones, troubleshooting, performance, wifi security and restore info/advice here
https://discussions.apple.com/message/16276201#16276201

I've used an external drive for time machine which has important files on it. After trying to back up my computer, it suddenly needed to be "repaired" by utilities. Now it's not being "seen" at all! How do I recover my important files off the drive?

I've used an external drive for time machine which has important files on it. After trying to back up my computer, it suddenly needed to be "repaired" by utilities. Now it's not being "seen" at all! How do I recover my important files off the drive?

If the external drive can be seen at all in Disk Utility, follow the instructions for repair here.

Looking at external HD for Time machine backup and for XP OS?

Bought a 24" iMac desktop with a 500 GB HD and am going to be running up to Best Buy to snag a Western Digital external My Book 750 GB HD. Mainly this external is for Time Machine backup, photos, iTunes library, etc. but I'd like to fire up boot camp and install Windows XP OS. Question is, can I install the XP OS on the external HD so I don't have to divide and possibly mess up my internal Mac HD? Also, when I do install XP OS, how much space for a partition? XP will be mainly for just a few PC games that are PC only like Company of Heroes.

Hi Saius,
yeah, the more the better...
BootCamp requires the use of XP with SP2. Without SP2 (SP1 or earlier) it either does not install or if installed can produce some odd errors.
If you have access to a Windows XP PC you can try these instructions to slipstream the SP2 together with your 'old' XP CD to a new XP SP2 CD.
http://www.winsupersite.com/showcase/windowsxpsp2slipstream.asp
Before spending some unneccessary dollars might be worth trying.
It's not very difficult to do this (done it myself some years back).
Also it is a good idea to use your external HD and make a bootable clone of your OSX volume using either SuperDuper or Carbon Copy Cloner.
That way in case something goes wrong, you can easily revert back.
Personally I would not use Time Machine for that task.
Have Fun and thanks for the star.
Stefan

Adding a Dedicated External Drive for Time Machine

Hello,
I want to use a dedicated external drive for Time Machine backup and another drive for a SuperDuper backup. Before even adding another drive, I'm already pulling and replacing usb connections from the back of my computer.
Can anyone tell me if a splitter is a workable solution? Something like this:
7-Port USB High-speed Hub with Splitter Cable -- http://www.shop4tech.com/user.htm?go=view_item&id=8997&r=183 -- or perhaps other recommendations ..
Thanks.

...I recall reading that USB 2 was faster ... but I think they said faster than FW 400, but the drive I have is FW 800.
USB2 is 480mbps and Firewire400 is 400mbps. On paper, this would appear that USB2 is faster than Firewire400. But USB2 cannot handle large data transfers very effectively. I can't explain the technicals, but suffice to say that the figures I gave of 40min-versus-2-hours-for-25GB is typical of Firewire400 versus USB2.
Firewire800 is 800mbps, so would potentially be even faster. However the physical hard drive that's installed in the Firewire enclosure would be the bottleneck as a normal "platter" hard drive is much slower than Firewire400 or 800. If it were an SSD drive, then you'd likely see a very significant difference.
But regardless, USB2 cannot keep up with a large data stream like Firewire can. Potentially USB3, which is up to 5Gbps, would be faster than either Firewire 400 or 800, although I suspect would be on par with Firewire3200 in the real world. However since there are no adapters for either USB3 or Firewire3200 for the Mac, it's a moot point for now. (Your drive is not USB3, there are only a few USB3 drives available, and you'd need a Mac Pro to add the adapter in anyway, if they existed.)
So are you saying that FW 800 is faster than USB 2.0 -- and that I should be using the FW connection to get better throughput? And that I can resume daisy-chaining multiple external drives through the one port?
Definitely Firewire would be faster than USB. And I have 5 external hard drives daisy-chained through a single Firewire800 port on my Mac. So daisy-chained Firewire is the way to go.
Like I said, for the small, incremental, hourly Time Machine backups, the speed difference is insignificant. But when the day comes that you have to restore your hard drive, (i.e.: hard drive dead so you buy new blank hard drive. Or you just want to replace with a larger drive,) if say your Time Machine backup is 80GB, that restore would probably take several hours over USB2. On my Firewire400 drive, my 100GB Time Machine restore of my Macbook Pro took about an hour and a half. (The data transfer was about an hour, but OSX took awhile after that to finish up the restore.) YMMV, of course, but IMHO, use Firewire over USB2 as much as possible. If you're lucky enough to have a Mac Pro or iMac and can use multiple internal hard drives or eSATA, then that would be even faster than Firewire800. Only owners of a Macbook Air or non-Firewire Macbook should resign themselves to USB2.

My 320GB external drive for Time Machine now only has enough capacity to keep a backup of one day. All my other backups are gone. What can I do to fix this situation?

I've been using a 320GB external drive for time machine for the last several years. The backups always worked fine and when necessary I was able to look at & restore older data from the time capsule. Recently, I keep getting the message that a backup cannot be completed and an older backup will be deleted. Usually this wasn't an issue because I still had several months of information on disk. Now a one-time backup takes up 315GB and therefore I only have a backup of the previous day. I don't understand this because I thought that the backup only saves information that has changed and doesn't copy everything everytime. What do I need to do to get my backups to a reasonable size so that I can keep at least 1 month data stored on it.? Please don't tell me I need a larger drive ... that would be too easy.

Get a larger drive for your TM backups.
The recommended size is 3 times what you are backup. So if 315 GB is a backup then you need a 1 TB drive.
Allan

HT3275 New macbook, old external drive for time machine

I got a new macbook pro a few weeks ago and set it up using my last backup from time machine. I want to use the same external drive for backups but there is no room. Can I delete all of the old files from the old computer or do I need to keep them?

kat.hayes wrote:
I want to use a 3 TB external drive for Time Machine to backup multiple 500GB hard drives in my Macpro. I have lots of large video files from HD cameras.
1. Will Time Machine backup all of the hard drives in the Macpro?
As long as they're formatted HFS+, yes. Be sure there's enough room, though -- Time Machine needs considerably more room than the data it's backing-up. See #1 in Time Machine - Frequently Asked Questions.

External drive for Time Machine

I want to use a 3 TB external drive for Time Machine to backup multiple 500GB hard drives in my Macpro. I have lots of large video files from HD cameras.
1. Will Time Machine backup all of the hard drives in the Macpro?
2. What is a good external hard drive to handles these types of files?
Thanks.

kat.hayes wrote:
I want to use a 3 TB external drive for Time Machine to backup multiple 500GB hard drives in my Macpro. I have lots of large video files from HD cameras.
1. Will Time Machine backup all of the hard drives in the Macpro?
As long as they're formatted HFS+, yes. Be sure there's enough room, though -- Time Machine needs considerably more room than the data it's backing-up. See #1 in Time Machine - Frequently Asked Questions.

Brand new iMac 23.GHz Intel Core i5. Mounts external drive for time machine, then dismounts after backup is complete.

brand new iMac 23.GHz Intel Core i5. Mounts external drive for time machine, then dismounts after backup is complete.

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

Partitioned external drive for Time Machine and Daily storage

Now that I've partitioned my I Terabyte external drive to two partitions using the disk utility with one partition for Time Machine and one partition as my new "hard drive"...my internal drive on the MacBook almost filled....I wanted to move...pix, movies, music..etc to the new drive and have all future storage pointed to that drive not the internal drive....need to have space available on the original drive on the MacBook....How do I move existing stored data and point ongoining saved music..files...etc to the new drive...???
Thank you...Bob

Yogabob wrote:
Now that I've partitioned my I Terabyte external drive to two partitions using the disk utility with one partition for Time Machine and one partition as my new "hard drive"...my internal drive on the MacBook almost filled....I wanted to move...pix, movies, music..etc to the new drive
You could use an application like CarbonCopyCloner or SuperDuper to copy them to the new partition, but it's probably just as easy to drag the files/folders to the new partition, then delete the originals.
and have all future storage pointed to that drive not the internal drive
You probably don't really want to do that. Files you're using will be accessed much faster if they're on your internal HD.
Another consideration is, you really should have backups of the moved files somewhere, in case you have a problem with the new drive. Although TM will back them up unless you exclude that partition, if the drive fails, you'll lose both copies.

Can I use the same external hd for time machine and storage without partitioning it?

Hello,
I have been using an external hard drive for my Time Machine that was only used for this purpose.
I downloaded some files in it that I want to use, and I haven't backed up using Time Machine since.
Can I download the files on my MacBook from the HD without running into any problems, or is there anything else I should do?
I prefer not to partition the hd, since I will be deleting these files, or transferring them to a different HD, and using this HD only for Time Machine back ups, as I did previously.
** I am not sure if this changes anything, but I just updated from Snow Leopard to Lion.
Thank you so much

carolsm wrote:
Thanks Kappy, I will do that.
I just really needed these files and had no other hard drive to store them.
Do you think that it will be okay just this one time if I download the files on my MacBook without compromising my backups?
I will transfer them to a new hard drive, and erase them from my Time Machine external hard drive.
For the time being it will be fine. There is always a chance of a disc crashing and therefore not advisable practice. Some here run seperate drives with Time Machine, Cloned backup and file backup. I have a portable drive I keep Time Machine backups and file backups on. I am running that at my own risk, but no problems over the last couple of years. Just make sure I get it to my normal TM Backup disk as soon as I get home. Backing up those other files will not compromise your Time Machine backups as you asked.
Cheers
Pete

Re-partition external drive for Time Machine

When I originally connected my external drive to my iMac I partitioned it for Time Machine and a media library for my iTunes. I decided to put iTunes back on the main drive to increase space on the external drive for my Time Machine backups. I have deleted the Media partition but the iDisk Utility will not allow me to increase the size of the Time Machine partition. (There is no "drag" graphic/option). Any help would be appreciated. I do not want to lose the backups I currently have on the external drive.

I've gone thru steps from this link I posted in a different forum.
http://discussions.apple.com/message.jspa?messageID=11538480#11538480

How can I make more room on external drive for Time Machine?

I now have Time Machine installed and in use on my external drive, which also still has my previous backup on it which used a different system (Dejavu). The external drive's capacity is 74 GB; 58.22GB are used, my iMac hard drive (backed up with TIme Machine) has 38.12 GB used, which by my calculation means about 20GB of the 58 on the external drive are the prior backup. Is there a way I can erase this prior backup, which now duplicates Time Machine, thereby making more room for Time Machine in the future? For instance, if need be, can I erase the whole thing and reinstall Time Machine on it? Thanks!

James, if you open your TM drive, I'm guessing you see the usual System, Library, Users, and Applications folder along with a folder labeled something like Backup.bkup. (I'm away from a TM backup and I can't exactly recall the name of the TM backup folder.)
The DejaVu backup is just a standard file backup using 'rsync' so you can delete whatever you want by simply dragging it to the trash and emptying the trash. If the drive is bootable, you may not want to lose that ability. But assuming there's nothing in your user folder on that backup that isn't also on your computer, you can delete just about everything in your User folder on that drive. You can delete selected applications too. And if you don't mind losing the ability to boot, you can drag everything but the TM backup folder.

How much to partition on External HD for Time Machine?

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