The backup disk image “/Volumes/ReadyNAS/My iMac.sparsebundle" could not be accessed (error (null)).
This problem started only after I upgraded from Snow Leopard to Maverick. Been searching for a solution online but none seems to work.
Anyone has any idea how to get TM to work again? Upgrading to Maverick is a huge mistake!
Help much appreciated! Thanks!!!
iMac, OS X Mavericks (10.9)
I have this issue as well. Struggled a couple of days to get TM to even connect to my ReadyNAS Duo. But after trying all sorts of things: Restarting NAS, Router, Upgrading firmware on NAS, Running Repar Disk on Sparsebundle, Reset of TM(deleting com.apple.TimeMachine.plist), Re-selecting Backup Disk, Restaring MAC etc.. I finally got to the stage where TM said "Preparing for Backup". But unfortunately after a while I got the messsage: "The backup disk image ".........sparsebundle" could not be accessed (error(null))".
I should say that TM has been running fine for the past couple of years in my environment.
I'm out of ideas. Anyone out there has some good ones?
Just to let you know. I've decided to start all over. Reset and initialize my ReadyNAS to factory default, customize it, resetting TM and then do a first full backup. So far so good. The backup has now started and will probably run for the next 15 hours or so.
http://support.apple.com/kb/ht1427
https://discussions.apple.com/docs/DOC-3105
Bothwill help solve your issue. Be sure you read them carefully.
Backing up to a third-party NAS with Time Machine is risky, and unacceptably risky if it's your only backup. I know this isn't the answer you want, and I also know that the manufacturer says the device will work with Time Machine, and that it usually seems to work. Except when you try to restore, and find that you can't.
If you want network backup with Time Machine, use as the destination either an Apple Time Capsule or an external hard drive connected to another Mac or to an 802.11ac AirPort base station. Only the 802.11ac base stations support Time Machine, not any older model.
If you're determined to keep using the NAS for backup, your only recourse for any problems that result is to the manufacturer (which will blame Apple.)
I don't know what say to other than this: If TM supports networking standards there should be absolutely no problems no matter which 3rd party product you're using. It all comes down to zero and ones.
Apple cannot and should not support any 3rd party NAS products.
It reminds of the "good old days" (i've been working with IT since 1972) where IBM would not support disk subsystems from any 3rd party vendors (they also claimed that it would be risky to store data on these disks). Everyone knows what happened:-) EMC and Hitachi are still in the disk business.
BTW I see a lot of problems from people using Time Capsule as their backup device. So I don't think that would be my first choice.
But thanks for your update.
Am taking your advice. Back up to external HDD to avoid any more complications. Hopefully future patches to maverick will resolve the NAS problem. In the meantime it'd be an oversized paperweight
Am waiting for 10.9.1 before attempting a factory reset on NAS and setting up TM again. Thanks everyone for your contribution!
FYI. My TimeMachine now works with my ReadyNAS Duo after I added a line to the /etc/hosts file: "192.168.1.13 NasDuo" and reselected the backup disk in TimeMachine. Hopefully it will continue to be that way🙂
Couldn't add this to hosts file. It's locked and I'm clueless with terminal...
Did it the brute force way with a factory reset for Duo. It works now! 🙂
Great. FYI my ReadyNAS Duo is still working. Backup and restore. Like it should be🙂
BTW there are a number of entries in the forum regarding updating of the /etc/hosts file. I used "sudo nano /etc/hosts"
Is NASDuo your own choice of name? I'm just wondering if I should be putting something else there in the hosts file.
Drag it onto your desktop - it will make a copy of itself.
Open with text edit.
Delete original - you will be asked for your passwod.
Drag edited copy to /etc/ folder - you will be asked for your password.
Done.
NasDuo is the default hostname in my ReadyNAS Duo, but it can be changed in the configuration (network-global settings). BTW my ReadyNAS Duo is still working as expected.
I've experiecing this same error on a MacBook Pro connected to a Time Capsule. Everything was working fine, until I (allegedly) "upgraded" to Mavericks. Then all **** broke loose. I sure miss the OS stability of Snow Leopard. Mavericks is horrendously slow and has wrecked havok with my Mac.
Are you using the latest version of RAIDiator? I think the latest version is 4.1.13 and a lot of issues with Mavericks and Time Machine have been ironed out. I'm on Mavericks 10.9.3 and was having a lot of problems until a couple of months ago.
You might also get better peer support on the NetGear ReadyNAS forums:
Mac forum:
http://www.readynas.com/forum/viewforum.php?f=28
Time Machine forum:
FYI, I ran into problems some time ago (again). TimeMachine would not recognise my ReadyNAS, although I could use the ReadyNAS for normal file transfers. I finally decided to retire my ReadyNAS from TimeMachine and only use it for normal files. Since then my ReadyNAS has been just fine. I then bought a standalone USB HDD for use with just TimeMachine and that setup has worked as well. My conclusion is that Mavericks and especially TimeMachine are not ready for NAS devices - yet.
Time Machine - sparse bundle could not be accessed (error (null))
