Airport exteme +usb HD Time machine question

I want to make sure that I do this right. I have 2 macs, and airport extreme. I have a USB hub plugged into the AIR Extreme. When I plug in a 1TB USB drive into the HUB, will I get the dialog box to use the drive as TIME Machine? Since I have two macs and want to back them both up over the network, do I have to configure both computers from the airport software, or will it automatically recognize 2 computers and start a backup?

Sorry, but Apple still does not support AirPort Disks for Time Machine backups. (ref: Mac OS X 10.5: Time Machine doesn't back up to AirPort Extreme AirPort Disks)

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Airport Extreme + USB HD + Time Machine

I've had a recurring problem with my Airport Extreme for several years. Any time I update the firmware on the base station to the latest available, I have issues accessing my USB hard drive plugged in to it for general usage or Time Machine backups. I believe the latest firmware that works trouble free for me is 7.3.2, which I'm having a hard time tracking down now that I've upgraded to 7.4.2.
Basic problem: Time machine back ups and access to the HD plugged in to the base station work fine immediately after the update. I put my computer to sleep, and upon wake up it can't communicate with the disk drive any more. The only thing that fixes it is to restart the base station. Then everything's fine again until another sleep or restart cycle my computer.
Like I said, everything works great on the older firmware (which I'm currently trying to track down again). But every updated base station firmware update Apple has released in the last few years has broken it.
Airport Extreme (purchased in 2007) running 7.4.2 firmware
Macbook (Black 13" purchased in late 2006) running OSX 10.6.3

Hello elehto. Welcome to the Apple Discussions!
Like I said, everything works great on the older firmware (which I'm currently trying to track down again). But every updated base station firmware update Apple has released in the last few years has broken it.
Since Apple does not support Time Machine backups to AirPort Disks, I don't think firmware changes will make any difference to the issues you are describing. (ref: Time Machine doesn't back up to AirPort Extreme AirPort Disks)

Airport Extreme + USB HDD = Time Capsule?

Hi!
(Sorry for my poor English, I hope it's possible to understand my problem/question).
I bought a MacBook in January 09. It's connected to the Internet via WLAN and a Fritz.Box (Wireless Router with built-in DSL Modem, unfortunately it uses the old slow LAN and WLAN protocol and a USB1-Port).
I want to backup my files with Time Machine via WLAN. I tried to connect a USB-Drive to my Fritz.Box but it was terribly slow (USB1...)
It's important, that the backups go automatically when I'm at home and connected to my WLAN.
Now I think of buying something that's more useful. I have three ideas and I'm not sure what to do...
1) Buying the Time Capsule. Pro: I think, it will work perfectly. I don't need to worry about a thing. Contra: It's terribly expensive. In Germany 1TB will cost about 600$. (Maybe I should buy the 500GB-Version and update it by myself to 1GB or 2GB).
2) Buying the Airport Extreme. Unfortunately I'm not sure if a Airport Extreme + USB-HDD is the same as the Time Capsule. Apple writes: "Time Machine in Mac OS X 10.5 Leopard can be used to back up to many kinds of Mac OS Extended-formatted drives, but you cannot choose AirPort Extreme's AirPort Disk as a Time Machine backup volume. " On the other hand some Users wrote that they managed to get their TM-Backup on a AE-HDD (but did this work via WLAN?). With the Airport Extreme it would be easy to manage a itunes-stream-server (the Airport Express is not too expensive). And the Airport Extreme isn't too expensive as well.
3) Using a Network-HDD. It would be not too good, since I had to use my slow WLAN-Connection and since this wouldn't be supported by Apple at all. On the other hand this would be the least expensive version.
What should I do? Is it possible to work with the Airport Extreme and an external USB-HDD via WLAN and without any problems (like mounting the drive manually each time I connect to my Network).
It would be much more fun, if everything ran automatically, when I got in reach of my Network...
Thanks in advance! Gerrit

A couple of pointers.
The hard drive must be specifically formatted in Mac OS Extended (Journaled) to work with the AirPort Extreme's USB port. Check the documentation that came with the drive to find out how it is formatted at the present time.....it is likely formatted to work with Windows, which is not compatible with the AirPort Extreme.
Unfortunately, even if the drive is formatted correctly, Apple does not officially support Time Machine backups to a drive at the USB port of the AirPort Extreme, so that will be the next hurdle to deal with.
Some users actually do seem to be able to make this work, but overall, it is not a reliable method to backup your data if it is important to you.

Is it possible to use NAS storage (which is wired via LAN to AirPort Extreme) as a Time Machine destination?

Is it possible to use NAS storage (WD My Cloud EX2 or WD My Cloud EX4) which is wired via LAN to current AirPort Extreme, as a Time Machine backup destination?
There are two reasons I came up with this question.
- Connecting via Ethernet should be faster than USB 2.0 connection
- 8TB NAS storages are slightly cheaper than 8TB USB HDD
If it is impossible, I am planning to buy My Book Thunderbolt Duo 8TB and wire it for MacBook Pro directly for the purpose of Time Machine backup.
I have a concern with my primal idea of backing up via WiFi, as I tend to handle big files when doing music production or movie editing. I wonder if this affect the performance of MacBook Pro, as it might take more time to complete each backup via WiFi.
Many thanks for your advice in advance,
Masa
MacBook Pro Retina 15 inch (Mid 2012)
Processor 2.6 GHz Intel Core i7
Memory 16GB 1600 MHz DDR3

I would appreciate any advice which could include aother sollition of secure and practical backup.

Currently have house wide wireless network and using external HD (USB) for time machine. HD broken. would Time capsule work with current routers etc or make them redundant?

I currently have a large house wide wireless network and I am using a dedicated Buffalo HD with USB for time machine. The HD has gone bad and can't be repaired. I am thinking of replacing it with a Time Capsule. Will this fit in with my current routers etc, render them redundent ? I THOUGHT THAT THE HD I BOUGHT WAS OF GOOD QUAILTY BUT IT HAS BROKEN AFTER 2 YEARS. HOW LONG CAN ONE HOPE FOR A TIME CAPSULE TO LIVE (USING QUALITY SURGE DEVICES ETC) ? Does one need to backup the backups?
ALSO: Is ther e any way to back up from Time Machine off site ( mobile me etc) in case the house burns down?

Steve M. wrote:
I know I should have redundant backups and should probably have a second external HD and eventually will.
Yes, that's best.
But for now, if I partition (I'm assuming I should) a new 1 TB external HD, how big should I make the TM partition vs. the SD partition at this point assuming I have under 100 GB on my internal Mac HD? Is this a feasible way of doing things here in the near term.
Your best bet is to make your TM partition 2-3 times the size of the amount of data you anticipate backing-up. Put it first on the drive; that way, later on you can delete the partition below it, expand the TM partition, and make a new, smaller partition for SD (or use the whole drive). See #1, #3, #5 and #6 in the Frequently Asked Questions *User Tip,* also at the top of this forum, for details.
By the way, any recommendations on which peripheral HDs to consider? I was very surprised on a recent visit to my local Apple Store that they have a large stock of WD My Studio drives. I mentioned to an Apple sales person that I had always heard WDs were kind of a no-no among Mac users but she assured me the current crop of them were much improved. Any comment on that??
Most any drive will work with Macs, and Time Machine.
If you're going to put a "bootable clone" on it, be sure it's a bootable drive. Most PPC Macs can boot only from FireWire; most Intels can boot from F/W or USB. But some Western Digitals won't boot a Mac. Their list of which ones should and +should not+ boot: http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/stdadp.php?pfaqid=1787. But note the disclaimer that they don't support it +*at all.+*.
In addition, many of them have a built-in sleep mode that cannot be disabled, and sometimes interferes with Time Machine backups: http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/stdadp.php?pfaqid=1376

Where to Post Time Machine Question?

My question title says it all. How do I find the area in which to post a Time Machine question? Or do I just do it here? Thanks.

There is no place to post a question on Time Machine

Charging iphone 3GS via USB on time machine

Is it possible to hook up your iPhone 3GS dock via USB on Time Machine for charging?
Any advice would be appreciated
cheers

Ansuz82 wrote:
assuming that its a powered USB port.
I don't believe its powered since Apple specifically states that only POWERED devices should be connected.

AirPort Extreme not seeing USB HD, time machine failure

I can't see my USB HD that I have connected to my base station. It works fine if I connect the HD directly to my computer. I have the drive sectioned into 2 partitions. One is formatted as MacOSX Extended (Journaled) for backing up my MacBook Pro via Time Machine, and the other is formatted at MS-DOS FAT32 so I can use it to transfer files between my Macs and my Windows machine. Everything was working fine for a while. Then my MacBook Pro couldn't find the HD connected to the base station. The only drive that would come up was the MS-DOS partition. I get a blinking amber light on my base station now with an alert that the disk needs repair and to connect it directly to the computer to repair it. If I disconnect the HD the light turn back to green. I re-partitioned the external hard drive and re-connected it to my base station. Now my Airport icon doesn't appear at all in the left sidebar. I re-formatted and re-connected the drive a couple different times. I tried formatting the drives differently, not partitioning the drive, etc. and nothing seems to work. I can't get the HD to show up again if it's connected to the base station, although if I connect it directly to my computer everything is fine. Therefore, I'm guessing it's not actually a problem with the HD, it's a problem with the base station reading the HD. I really want to set this up with 2 partitions so I can use part of it to back up my laptop via time machine. That was actually the whole point of purchasing the 500GB HD. The HD is a 500GB SimpleTech. Does anyone out there have any help or suggestions????? :-S

Oh cool. That's interesting. I'm going to reformat my entire external HD as MacOS Extended and use it all as extra storage then.
One more question. If I got a time capsule, then I actually wouldn't need my Airport Extreme base station right? So I could set up a time capsule in place of the Extreme and still attach my 500GB external to the Capsule as a network storage device. Correct? So it's another thing to buy, but I would gain a lot of extra storage space and I would have something I could rely on for backup.

USB drive attached to Airport Extreme as a time machine backup?

I have a WD 750gb external USB drive that I was using as a "time machine" with my iMac. My Airport Extreme has a USB port and I want to move the WD over to there, but continue to use it as time machine. Possible to do this? If yes, then how?
Thanks much

You can, but Time Machine uses a disk image file for the Time Machine archive (instead of a folder) when a network drive is used. Therefore, you may have to start your Time Machine archive over again.
If you have one Mac to back up with Time Machine, it is better to leave the drive attached directly to the computer over USB. Your initial and hourly Time Machine backups will complete faster.

Time Machine questions: Handling backups for multiple Macs to one FW drive

I am reviewing the Time Machine thread and seeing a lot of helpful information, but I would like to ask something I haven't quite found yet.
We have 2 Leopard Macs, a MacBook Pro and an intel iMac... with plans to upgrade another MBP from Tiger to Leopard at some point.
In planning for Time Machine, we set up a 1 TB drive, attached it via FW 800 to the iMac, partitioned it GUID for Intel, and made 3 partitions, one for each planned Mac we want to back up to it.
I started Time Machine on the iMac first and the first backup of about 100 gb took maybe 4 hours.
Then we tried to start the Time Machine backup for the MBP over the network (wireless). It was understandably much slower and quit with some error last evening, so I took advantage of the pause to move the notebook to a wired ethernet connection. It got even slower so this morning I directly connected it FW 800, erased what had been backed up, and started over. So far, so good. 6GB out of 100 in 10 minutes or so. The idea being, if we can get the first backup completed faster over wired connection, maybe doing the incrementals over wireless network will be okay. Sounds like some folks are doing that successfully. I am hoping that works out.
Questions: Was it necessary to partition my 1TB drive into a partition for each Mac's Time Machine backup? I did make each partition bigger than the hard drive it is designated for.
To get the MBP to mount the external FW drive on its desktop, I had to disconnect the drive from the iMac. Is there any way I can connect the FW drive to both the MBP and the iMac (the drive has two FW 800 out connections, so it is physically possible)? I'm thinking (from reading posts of others with notebooks) that one strategy is to connect your notebook to your Time Machine drive at night and let it back up, but it'd be great if I could leave the iMac connected while doing so. Is there a way the volumes on the drive can mount on both desktops?
When I try wireless again, I'm seeing mixed posts regarding whether the MBP will need a password to log in to the remote volume each time, or only the first time when the Time Machine backup is established... if I could get clarification on that, it would be helpful.
Thanks!
thanks

What do you see on your notebook when you click on your TimeMachine icon in the Dock?
My notebook is mounting the backup drive on an hourly basis, running a backup, and looking like it is doing something... but when I then look at TimeMachine, I can't see the backups. (On my iMac with the drive directly attached, I see a progression of windows showing all the hourly backups the last 24 hours, etc.) I just called Apple to ask why this is so, and they told me they couldn't help me because wireless Time Machine backups aren't supported.
I know backups to a hard drive attached to an Airport Express Base Station are not supported. But when they say "You can designate just about any HFS+ formatted FireWire or USB drive connected to a Mac as a Time Machine backup drive. +Time Machine can also back up to another Mac running Leopard with Personal File Sharing, Leopard Server, or Xsan storage devices+"... well, how can you DO that?

Time Machine question.

Hello. Im not sure exactly where to post this, i couldnt find a Time Machine section. Ill make this as short as possible.
I have a 2011 mac mini with snow leopard 10.6.8 and my wife just bought quick books accounting software which requires 10.8 mountain lion, so i just bought it, although i havent installed it yet and here is why. I started another thread the other day about weather or not i HAD to update to Yosemite, all the reviews are making me nervous so im opting for Mountain Lion. So, in my thread a member asked me how i back up my mac mini, well i dont and never have. But i recently got a 1TB external hard drive which im going to return for a 2TB. This member was talking to me about mountain lion and suggested that i install it on my external hard drive so that i could keep my nicely working Snow Leopard as well as having Mountain Lion for my wifes quick book program. As we spoke, the member said he wasnt sure id be able to back up my mac mini with Time Machine onto the 1TB as well as install Mountain Lion onto it and i also plan on putting a few thousand pictures on it. Can someone tell me if this is possible? I know ZERO about time machine and backing up for that matter. Ive never done it. So another question, if i was to back up using Time Machine and a 2TB external hard drive, would that also back up all my photos in iphoto, my photoshop program and Toast editing? Would all of that be backed up? Am i making any sense? LOL.
Thanks.

zowenso wrote:
So, are you saying that I should have a totally different external hard drive to use for time machine back ups?
Would it be safe to store all my pictures and the installation Mountain lion back up on one external hard drive or am I going to have to get a separate one for each?
Also, what if I just did the standard update to mountain lion and didn't save it to an external hard drive? Could I then use one external hard drive for my pictures and the time machine back ups?
Yes. Use a different drive for your Time Machine back ups.
You could use a 2TB external USB drive, partition it into 2-1TB partitions, install OS X Mountain Lion on one and point your Time Machine back ups to the 2nd 1TB partition. I think you should be able to use this 1TB partition for both your Snow Leopard and Mountain Lion Time Machine back ups. Just point each to that 1TB partition. All of your data (photos, music, documents, Quickbooks data, etc.) would be backed up by Time Machine as it backs up the entire drive (OS/Apps/Data). So, if you use that 1TB partition for both back ups, both drives (SL on your Mac Mini and ML on the external 1TB partition) will be backed up.

Hard drive, SSD, Time machine question

I was using a Macbook Pro mid 2012 13" for this problem.
About a month ago, I upgraded my hard drive to a Crucial Solid State Drive (SSD) 240 gb m500. I used Carbon Copy Cloner and everything went very smoothly and my computer worked great for about two months. Randomly one day, I turned on my computer and got a WHITE SCREEN. I have tried several things to try and correct this SSD but none of them will work. I have come to the conclusion that it is a broken/unusable SSD and am returning it.
My problem comes that my time machine backup is on my old macbook pro hard drive. I want to put back in that hard drive into my MBP with all my files intacted, but of course it is not in the right format to run.
I have access to another MBP, a 500 gb external drive, as well as a internal hard drive enclosure to plug my old hard drive into USB externally.
My question is would it be to risky, if I backed up my friends MBP to the 500gb external hard drive using time machine. Then I put my time machine backup on his computer. Then make a copy from his computer of my time machine backup to my old MBP hard drive. Then put my newly copied hard drive back into my MBP. And then take my friends MBP and time machine his backup back from the external drive back onto his computer.
Let me know if you have any other ideas. Thanks
~Katherine

With the SSD still in the MacBook, hold down the Option key at Startup. This will draw an icon for each potentially-bootable drive.
Now go away from your Mac and leave it powered on doing nothing for 20 to 30 minutes.
Sometimes an SSD gets so clogged with data it needs idle to do a major Garbage collect, but thinks it is still being accessed, so it delays the Garbage Collect. Leaving it alone for 20 minutes or more MAY allow it the time to fix itself.
If this helps, read this article on TRIM:
http://en.wikipedia.org/wiki/TRM
consider installing TRIM Enabler from Groths.

Using External HD connected to Airport to use for Time Machine - Problems

Hello,
I have an Airport Extreme (1 USB port on back) and want to use an external HD as the Time Machine. Originally I had the HD connected to the Airport and just using as storage. We have 2 Macbook Pros and both could see this HD when used this way.
I have since decided to use the HD as a dedicated Time Machine storage device (my MacBook crashed). I was instructed to reformat HD (which I did) and plug into each laptop to initialize the Time Machine (which I did). Both laptops saw the HD and did a backup.
Unfortunately when I went and plugged the HD back into the Airport it was not reconized by either laptop and I could not initialize Time Machine (TM did not "see" the HD as the storage device.
I can still plug the HD into each laptop and it will do a backup but would like to get this conected so it is automatic.
Both laptops have Snow Leopard installed
Any thoughts or suggestions?
Thx
Jim

Sorry, the older "round" (looks like a flying saucer) AirPort Extreme cannot support a hard drive. It will only support a compatible printer at the USB port.
You need the "square" AirPort Extreme to be able to connect a hard drive at the USB port. It looks like this AirPort Extreme. Or, do you mean to say that you have this model?
Message was edited by: Bob Timmons

Time machine questions. Please help

So, I'm getting rid of my laptop and switching.    I've had my time machine external HD plugged into my airport extreme doing backups.   Well, I just plugged it into the laptop directly and hit backup
So is it really just as simple as plugging the HD into the next computer and hitting "restore"    Is there any extra steps?   Will it come back just like this one is set up?
I'm nervous that I accidently deleted an older backup in time machine through the finder to make space for the new back up.   I hope that doesnt mess anything up.    This backup is only like 90 mb.    IS that cause it took previous ones so its only adding the new data since the last backup an hour ago?
I want to not include my movies that are in iTunes,    They eat up about 60 gb of space and my new computer HD will be smaller.   Is tehre a way to do that? I currently have the movies themselves copied onto the external.    But cant seem to get them out of my iTunes library.    Couple of questions regarding that..
    1. Is this a good idea
     2. Is that the best way to do it
     3, will doing that mess with my backup at all?
     4. How do I get them out of my itunes library to shrink the overall backup?
If my backup IS larger than my new HD, can I pick and choose what I want to put into it or not? Or will it give me message saying the backup is too large?
I know this was a lot of questions. But if anyone could please help I'd greatly appreciate it.
Thank you for reading.
----Confused and nervous

In order to do a TM restore, that means erasing the hard drive and restoring from a TM backup which will put everything back the way it was before, including the operating system. However, since you're getting another computer, don't go that route. I would only use that when restoring to the same computer.
You said you deleted backups via the Finder. Wrong move. You may have damaged your TM backup. Always better to delete from within TM.
If you're switching to a new computer and you don't need backups from different times, I would erase that external and create a new backup, or clone your hard drive using Super Duper or Carbon Copy cloner.
With the new computer, when you first log in, you will be asked if you want to migrate your data. This is the Setup Assistant. You should have your backup drive plugged in and imediately migrate your user account from the backup drive. You can also migrate applications (any apps installed by you), or just reinstall them after if you want a clean installation. You should have the option to unselect any data from your user folder that you don't want to migrate.

6th Generation Airport Extreme Freezing During Time Machine Backups using LaCie 1TB Hard Drive

I recently upgraded from a 4th generation Airport Extreme (short, dual band n) to a new 6th generation Airport Extreme (tall, dual-band ac) in the hopes of having quicker backups and better WiFi performance (I also just got a 13" retina MacBook Pro).
The upgrade has gone poorly, to say the least. Initially, I set up the new Airport Extreme as I had for the old one. Then I plugged in the same hard drive I was using (a LaCie 1 TB d2 Quadra USB2 drive that I bought in June of 2009). I decided to setup my wife's Time Machine backup first (she has a 2010 MacBook Air). I removed the "old" disk (the one associated with the old base station) from her Time Machine configuration, and set up her Time Machine configuration to backup to the same disk on the new Airport Extreme. I was pleasantly surprised to find that it picked up her existing Time Machine backup and incrementally synchronized to it (the backup size was about 300 MB). A few days later, she warned me that Time Machine told her that backups were not working. When I went to look, it was indeed failing.
I tried a few things that didn't work, and I suspected that maybe the backup "transfer" hadn't gone so smoothly as it seemed, so I decided to erase the drive using Disk Utility and start the backup over again. To my disappointment, I found that the backup got about 200MB-1.5GB into the backup and "froze." I left it overnight, and it was at exactly the same place the next morning. The light on the disk connected to the Airport Extreme flashed constantly all the time, and I could hear it spinning, but nothing happened at all.
When I tried to stop the backup, it took a very long time. In the logs, I would see a message like this (this log is from my machine, not my wife's, but it looks the same):
11/19/13 9:40:59.276 PM com.apple.backupd[93334]: Forcing deep traversal on source: "***-mpbr" (device: /dev/disk0s2 mount: '/' fsUUID: 7356274E-D28F-3BC0-9CA8-7F1AA21830B4 eventDBUUID: 99941F9A-AD5F-4FAF-94D2-701C94CA9581)
11/19/13 9:41:57.609 PM com.apple.backupd[93334]: Total content size: 148.2 GB excluded items size: 17.16 GB for volume ***-mpbr
11/19/13 9:41:57.610 PM com.apple.backupd[93334]: Found 674166 files (131.05 GB) needing backup
11/19/13 9:41:57.611 PM com.apple.backupd[93334]: 152.52 GB required (including padding), 498.67 GB available
11/19/13 9:41:57.625 PM com.apple.backupd[93334]: Waiting for index to be ready (100)
11/19/13 9:59:22.407 PM UserEventAgent[11]: com.apple.backupd-auto launchd job disabled
11/19/13 10:00:15.103 PM com.apple.backupd[93334]: Cancellation timed out - exiting
Looking at the Airport Extreme in Finder, I saw that it got stuck, either "Connected as" me, or "Connecting...". The Airport Extreme wouldn't respond to the "Disconnect" or "Connect As..." buttons (depending on the context), and the eject button for the Airport Extreme itself in the sidebar was also unresponsive. Eventually, after 2+ minutes, I got a dialog saying "Couldn't connect to [my base station name]" with instructions to "check its IP" and contact my system administrator if the problem persists. During this time, Finder can seem frozen and unstable.
Through all of the above, the hard disk kept spinning and the light flashed constantly. The drive was warm to the touch in the morning.
I also found that when all this happened, I was unable to connect to the Airport device using Airport Utility. I I couldn't administer it, but the Internet continued to work for all connected devices. Unplugging the disk and plugging it back in worked immediately to bring the system back to a working state. I didn;t even have to power-cycle or reset the Airport Extreme.
I tried a number of things to correct this behavior:
Disabled Time Machine, removed disk, restarted machine, reconfigured Time Machine, and retried.
Tried backup on my 13" Retina MacBook Pro and my wife's MacBook Air.
I actually tried with TWO new 6th Generation Airport Extremes. The first one was a refurbished one. I returned it to Apple and purchased a brand new one. Both of them exhibited the behavior I described above.
Workaround:
Finally, I switched the drive out for a spare that I have (an older Western Digital MyBook and used it for a backup. This drive "Just worked."
So, I have switched to that for backup for now, and re-purposed the LaCie as a drive that I use for making periodic images of my hard drive using SuperDuper. The drive seems to work perfectly (and worked perfectly for several years with older Airport Extreme base stations), so I can only assume there's a bug in the USB driver of the current 6th-generation Airport Extreme.
I hope this helps someone else who's as confused as I was. If anyone has had a similar experience, I would very much like to read about it. I will be reporting this problem to apple right after I post this topic. Please do the same if you experience this issue.

As Bob says, backing-up that way isn't supported.
It's also unreliable. It may work for a while, but this forum, and the Time Machine forums, have many, many posts like this:
*"I've been backing-up via an Airport Extreme for* <some number of days, weeks, or months> *and all of a sudden my backups are corrupted beyond repair."*
In my case, it's happened about 4 times in a year. And that's with a desktop Mac, about 12 feet from the Airport, with the exact same hardware in exactly the same place and no interference.
It is very convenient, especially with laptops. If you want to take the risk, see [Using Time Machine with an Airport Extreme Air Disk|http://web.me.com/pondini/Time_Machine/Airport.html] (or use the link in *User Tips* at the top of this forum).
But do yourself a LARGE favor and take the prominent advice to keep secondary backups, and update them frequently. Sooner or later, you're probably going to need them.

Airport exteme +usb HD Time machine question

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