Unable to write to time machine...

I have been unable to backup to timemachine all this week..any reason why time machine now says its read only...what changed?

This is a real issue. The same read only error started to pop up on my screen a few days ago and I am really hesitant to re-format the USB HD I use for backups. Something happened, and I don't know what. Just one day, instead of backing up, TM said the disk was read-only. Which it's not, not if you believe Disk Utility info, saying; "Writable: Yes."
I also tried to write on the HD and it worked.
Somehow, TM now think it read only. I use the external USB HD with Airport Extreme so I'm leaning towards the idea that the problem is with Airport. Not sure why, though, because TM won't back up on the disk even if it's hooked on my Macbook with a cable.
I've remounted the disk, I've swiched it off, restarted my network, but nothing seems to work. Any ideas?

Similar Messages

I am unable to access prior Time Machine backups.

I am unable to access prior Time Machine backups. I can see previous backups when I enter TM but they do not respond when I click on them. My TM is backing backups and at one time I was able to access them. I am logged on to my Mac Pro as the admin. I am running 10.9.5 and the TM disk is an internal 2 TB drive with 12 GB free.

The 12 GB free may be the cause.
Also see:
http://pondini.org/TM/Troubleshooting.html

Unable to restore from Time Machine after an erase and reinstall - MacbookPro cannot access my old Time Machine backup volume. Desperate for help please?

My MacbookPro would not move past the Apple logo and spinning wheel for a number of hours. After trying the numerous suggestions to solve the issue I eventually opted to erase and reinstall feeling confident my Time Machine backups would come to the rescue. After a successful erase and reinstall I tried to restore all my data from my TIme Capsule using Command-R during start up and by using the Migration Assistant. Neither worked and I have received messages to the effect that the backup volumes on my Time Capsule cannot be access because I have entered a wrong password or because the backup volume is damaged.
When I open my Time Capsule in Finder and click on my sparsebundle I get an eror message saying that the disk image could not be opened and that the resource is temporarily unavailable.
Desperate for some help and comfort that many years of personal data have not been lost.
Thank you.
M

When I try to Verify option it says Unable to Verify - Resource temporarily unavailable.
Here is the past of the log screen:
2013-06-09 15:00:00 -0500: Disk Utility started.
2013-06-09 15:09:01 -0500: Disk Utility started.
2013-06-09 15:19:53 -0500: [DUDiskController viewablePartitions] expecting DUDisk, but got nil
2013-06-09 15:19:53 -0500:
2013-06-09 15:20:00 -0500: [DUDiskController viewablePartitions] expecting DUDisk, but got nil
2013-06-09 15:20:00 -0500:
2013-06-09 15:20:05 -0500: [DUDiskController viewablePartitions] expecting DUDisk, but got nil
2013-06-09 15:20:05 -0500:
2013-06-09 15:20:13 -0500: Verifying Image “Macajee’s MacBook Pro”
2013-06-09 15:20:14 -0500: Unable to verify “Macajee’s MacBook Pro.” (Resource temporarily unavailable)
2013-06-09 15:20:14 -0500:
2013-06-09 15:25:21 -0500: Verifying Image “Macajee’s MacBook Pro”
2013-06-09 15:25:23 -0500: Unable to verify “Macajee’s MacBook Pro.” (Resource temporarily unavailable)
2013-06-09 15:25:23 -0500:
2013-06-09 15:25:27 -0500: Attach Image “Macajee’s MacBook Pro”
2013-06-09 15:25:27 -0500: Initializing…
2013-06-09 15:25:31 -0500: Attaching…
2013-06-09 15:25:31 -0500: Finishing…
2013-06-09 15:25:32 -0500: Unable to attach “Macajee’s MacBook Pro.” (Resource temporarily unavailable)
2013-06-09 15:25:32 -0500:
2013-06-09 20:02:06 -0500: Disk Utility started.
2013-06-09 20:05:22 -0500: Disk Utility started.
2013-06-09 20:07:11 -0500: Disk Utility started.
2013-06-09 20:18:34 -0500: [DUDiskController viewablePartitions] expecting DUDisk, but got nil
2013-06-09 20:18:34 -0500:
2013-06-09 20:19:34 -0500: [DUDiskController viewablePartitions] expecting DUDisk, but got nil
2013-06-09 20:19:34 -0500:
2013-06-09 20:19:36 -0500: [DUDiskController viewablePartitions] expecting DUDisk, but got nil
2013-06-09 20:19:36 -0500:
2013-06-09 20:22:29 -0500: [DUDiskController viewablePartitions] expecting DUDisk, but got nil
2013-06-09 20:22:29 -0500:
2013-06-09 20:22:33 -0500: [DUDiskController viewablePartitions] expecting DUDisk, but got nil
2013-06-09 20:22:33 -0500:
2013-06-09 20:22:45 -0500: Verifying Image “Macajee’s MacBook Pro”
2013-06-09 20:22:45 -0500: Unable to verify “Macajee’s MacBook Pro.” (Resource temporarily unavailable)
2013-06-09 20:22:45 -0500:
2013-06-09 20:34:53 -0500: [DUDiskController viewablePartitions] expecting DUDisk, but got nil
2013-06-09 20:34:53 -0500:
2013-06-09 20:34:56 -0500: [DUDiskController viewablePartitions] expecting DUDisk, but got nil
2013-06-09 20:34:56 -0500:
2013-06-09 20:38:17 -0500: Verifying Image “Macajee’s MacBook Pro”
2013-06-09 20:38:17 -0500: Unable to verify “Macajee’s MacBook Pro.” (Resource temporarily unavailable)
2013-06-09 20:38:17 -0500:
2013-06-09 20:47:35 -0500: Disk Utility started.
2013-06-09 20:53:06 -0500: Disk Utility started.
2013-06-09 20:55:30 -0500: Disk Utility started.
2013-06-09 20:56:40 -0500: Disk Utility started.
2013-06-09 21:06:32 -0500: Verifying Image “macajee’s MacBook Pro”
2013-06-09 21:06:32 -0500: Unable to verify “macajee’s MacBook Pro.” (Resource temporarily unavailable)
2013-06-09 21:06:32 -0500:
2013-06-09 21:07:08 -0500: Verifying Image “macajee’s MacBook Pro”
2013-06-09 21:07:08 -0500: Unable to verify “macajee’s MacBook Pro.” (Resource temporarily unavailable)
2013-06-09 21:07:08 -0500:

Help, please. Unable to restore from time machine.

My mid 2011 imac had been working fine. I needed to restore to an early version. I have attempted to do so using the comman + R function during boot up. I followed the directions provided. However, after a while this shows up:
panic(cpu 0 caller 0xffffff800d8c0ac1): "Unable to find driver for this platform: \"ACPI\".\n:@/SourceCache/xnu/xnu-2422.90.20/iokit/Kernel/IOPlatformExpert.cpp: 1541
Debugger called: <panic>
Bactrace (CPU )), Frame : Return Address
0xffffff8085fabdc0 : 0xffff800d422fa9
0xffffff8085fabe40 : 0xffff800d8c0ac1
0xffffff8085fabe50 : 0xffff800d892f1f
0xffffff8085fabea0 : 0xffff800d892adf
0xffffff8085fabf30 : 0xffff800d88e6b9
0xffffff8085fabf70 : 0xffff800d893633
0xffffff8085fabeb0 : 0xffff800d4d6ff7
can't perform kext scan: no kext summary
BSD process name corresponding to current thread: Unknown
Mas OS version:
Not yet seen
Kernal version:
Darwin Kernel Version 31.1.0: Thu Jan 16 19:40:37 PST 2014; root:xnu-2422.90~2/RELEASE_X86_64
Kernel UUID: 9FEA8EDC-B629-3ED2-A1A3-6521A1885953
Kernel slide: 0x000000d200000
Kernal text base: 0xfffff800d40000
Please help. I need to get my imace working again asap with all my information.

First, to the why. Shear silliness. It's a long story, but I needed to access a website that was cached to view its source code (long story) but only the version in the cache. Unfortunately, I opened that website after the important code had been removed thus removing the old cache version (it's one of those sites that saves only your most recent visit). In an effort to retrieve this information I had the not so brilliant idea to restore my computer. I didn't realize at the time that I propably could solely restore just the cache and not the entire machine. However, in my mind it should have made no difference. Just simply restoring from a backup. Afterall, thats why we backup.
Second, how early? To a version 12 hours younger. So, everything should have been up to date.
Here's some even newer information:
Last night, before your reply, I was able use the command + R function on boot up again. This time I reinstalled the operating system using wifi. The computer is now working, but did not restore. During the installation I was given the option using migration assistant to use my most recent backup. I did this, following the directions given (it's pretty simple--just click when it tells you to). Despite it saying that the migration worked my computer doesn't have any of my old stuff.
I really need to get my info back. I had thought this is why we use time machine and allow it to backup my system a billion times. Its very frustrating that this is not working.

Unable to use a Time Machine backup

I am getting very frustrated, as I cannot use a Time Machine backup the way I want to.
Short story, my Macbook Pro Retina (running Yosemite) is, and have for a while been, a litte buggy and slow, so I wsh to to a clean install of OSX, and use migration assistant to recover files and settings. I have tried to to a complete restore, but this hasn´t helped.
The problem is, the migration assistant can´t find the backups. When I restart with Cmd+R and prompt a restore from TimeMachine backup, it CAN find both mine, and other backups stored on the disk. But after I do a clean install, and get to the assistant, it CAN´T find any of the backups.
The backups are on a WD 2TB disk, connected via my Mac Mini.
I have tried creating another account on the fresh install, and verify disk and permissions. One time, that actually made the assistant find the backups, but I have never been able to recreate this. I did not try to copy the files on that occation, somehow.
I don´t understand how the two backup modes works differently. Complete restore cand find the files, assistant cannot.
IMPORTANT NOTE: The backups are created via a Mac Mini sharing the Time Machine disk. My backup is created as a disk file on Timemachine/Mybackup, and the Mac Mini backup is another level down on Timemachine/backups/Macmini. I don´t know if this has anythong to do with it.
On trying to recover, I have plugged the external drive directly into the MBP.
I have had to go back and to a complete restore every time, but I am not satisfied with this result.
I have tried to explain as good as I can, and will be very grateful for hints and tips.

A possible reason for backups not to be available in Migration Assistant is that the computer doesn't have a name, or the name is corrupt. Open the Sharing preference pane and check the name. If you can't do that, reset the PRAM. Credit to ASC member Csnote for this observation.
Otherwise, starting from a clean installation of OS X, set up a new administrator account and log in. Enter Time Machine and press the key combination shift-command-C. The front window will show all mounted volumes. All snapshots should now be accessible.* Select the one you want and navigate to your home folder (in the Users folder at the top level of the old startup volume.)
You should now be able to restore your user data. I suggest you do this in two stages. Quit all applications except the Finder before you begin.
Restore all the visible items at the top level of the home folder.
Hold down the option key and select Go ▹ Library from the Finder menu bar. Enter Time Machine and restore all items in the Library folder. Log out and log back in as soon as the restore is complete.
Any other invisible folders or files at the top level of the home folder that you want to preserve will have to be restored separately. For most users, that isn't necessary.
You may have to reinstall all third-party applications from scratch. That would be the only point of doing a clean installation.
You'll have another problem because you erased the startup volume. The next time you back up, Time Machine won't recognize any files as being the same as they were before, and will make a full copy of all files. There might not be enough space on one or more of the backup volumes for that. There are different ways of dealing with that situation, depending on your needs. The easiest way is to set the backup drives aside, if possible, until you're sure you'll no longer need the data on them, then erase them and start over. Meanwhile start a new backup on one or more empty storage devices. If that solution isn't workable for you, ask for instructions.
*If you don't see any snapshots in Time Machine, exit the time-travel view and then hold down the option key while selecting
Browse Other Backup Disks...
from the Time Machine menu, which has an icon that looks like a clock running backwards. Select the backups of the computer by its previous name. If you don't have the Time Machine menu, open the Time Machine preference pane in System Preferences and check the box marked
Show Time Machine in menu bar

HT3275 Unable to backup using Time Machine after hard drive was replaced

I recently had my hard drive fail and I had the hard drive replaced. I restored everything from my Time Capsule without a problem. Now when I go to backup with the Time Machine, it stalls. It states it is "backing up: 12.2MB of 227GB" for the past four hours. I have attempted to restart the backup and have had the same thing happen. Any suggestions? Thanks!

If you have restored the backup, did you correctly inherit the old backup when you setup TM again??
See Pondini on inheriting backups. B5 and B6
http://pondini.org/TM/Troubleshooting.html
Install the widget.. A1
Do a full reset of TM.. A4
Do a verify of the disk and the backup.. A5.
I strongly recommend you simply start over.. this happens with TM sometimes.
Archive off the old backups if you still want to keep them.. no bad idea in case there is something still to transfer.
In the airport utility erase the hard disk of the TC.. and then start again.
Make sure you do at least the first backup by ethernet as it is many times faster than wireless.

Help Upgrade to Maverick fails - now unable to restore from time machine as well

Hello,
I have an iMac (2008) which was running snow leopard. The App store reminders to upgrade for free to Mavericks got me today and I decided to go with the upgrade. After the down load of the s/w and while rebooting, it prompts for user id and password.
My iMac has always had an user id and a password. But strangely it would not accept the valid password for the user id. I have retried it several times and it will not accept the password. Not knowing how to proceed, I wanted to revert back.
So I pop in the Snow Leopard bootup DVD and when it starts, I connect to my wifi and choose utilities to perform a time machine restore. The backup was done just prior to my upgrade to mavericks. I am able to mount my external network storage and locate the time machine backup and choose the disk to restore to and the process starts and after a few minutes it aborts.
There is a log file that is shown - but the contents are not easily understood.
Now I have and iMac that is not functional. I am looking for some help.
I would be open to installing Mavericks from scratch - but I do not have the bootable USB. I would like to use my network drive and use that to start my computer with Mavericks and then possibly extract the data from my time machine backup. I am hoping that the restore of my data files / pictures / documents etc can be restored from time machine.
Any ideas how I can proceed from here? Thanks in advance.
ifmx4ever

MichelPM,
Have been offline all along. I resorted to your advice and went with installing Snow Leopard on the external hard drive booting the system on that.
I first tried recovering my Time machine backup - but did not work. So I ended up installing Mavericks on the internal hard drive on my iMac first. Then I was able to connect to my Time machine backup and restored all my data and documents. I chose not to recover the applications. The only useful app that I used was office for mac 2011. I went to microsoft's website to do a fresh install of office for mac 2011 and I am back in business.
Overall a painful way to get an upgrade done. On to my next task - preparing a bootable drive with Mavericks and to back up on Time machine.
Thank you for your suggestions.
ifmx4ever

Unable to restore from Time Machine Backup

Hello,
My system recently crashed after removing the Boot Camp partition for Windows!
But No problem because I have everything backed up on my Time Capsule!
But actually there is a problem... I inserted my Mac OS X 10.5 Installation disk and tried to restore from a backup done on Mac OS X 10.6.1...
After 3 hours it told me that the restore was sucessful but when I restarted, a grey screen appeared and told me to restart again... And I keep getting that screen each time I try to boot.
I tried to repair the disk using disk utility but still getting the problem!
Can it be caused because the backup was made on Mac OS X Snow Leopard (10.6.1) and I am trying to restore using a Leopard disk (10.5)?
Thanks in advance.
Mathieu
Message was edited by: matappassamy

Tobstar007 wrote:
I had the exact same issue, and thought I was safe with my computer backed up. After failed attempts to restore with the 10.5 disk I got my 10.6 Snow Leopard disk back off my friend. I erased the hard drive and reinstalled Snow Leopard, thinking I could use the migration assistant. Not so, since I had renamed my hard drive from Macintosh HD to a different name, there was but one backup I could choose from which was 10.5.6 or something like that and that was right when I first got my computer. So now I thought: oh now I have Snow Leopard installed on here and I have the Snow Leopard disk, restoring should work. Six hours later it was at 71% telling me it could not restore files. THIS IS INCREDIBLY FRUSTRATING. So right now my computer is yet again going through the unneccessarily arduous journey of erasing it's hard drive and restoring from a backup of 10.6, not 10.6.1 which was made in September. Any help with this failure of Time Capsule and Time Machine would be appreciated. I had to type this on my iPhone since I don't have any computer at the moment. :'(
Try doing a full system restore from your TM backups. See the instructions in item #14 of the Frequently Asked Questions *User Tip* at the top of this forum.

Unable to restore from Time Machine

Hi
I'm having some problem restoring from Time Machine. Here are the steps i've taken to do that but it won't boot after restoration.
Macbook Pro, 2011 Model with 10.7.3.
1. My Mac have 3 partitions (MacHD, Drive A, Drive B) - MacHD has Lion and all other apps, A & B are for my stuff like music, movies etc...
2. I backed it up using Time Machine but in the option I only back up MacHD (A & B) are not backed up.
3. Restarted and Command-R into Disk Utility
4. Erase MacHD using DU. Note: I enabled FileVault so once that's done, its locked but it can be unlock from Disk Utility
5. Restore from TimeMachine, now here's the problem
Once time machine is finished, it reboots my Macbook but keeps going back to the set up screen.
I tried to change the start up disk but this is the error i have is this “you can’t change the startup disk to the selected disk. Building boot caches on boot helper partition failed”
Now i've tried these steps
6. Tried to use http://d43.me/blog/126/building-boot-caches-error-when-changing-startup-disk/ --> by going into Terminal but still doesn't work
the command in that help doesn't work, sudo nano /Library/Preferences/SystemConfiguration/com.apple.Boot.plist
7. Tried Reinstall Mac OS X but the screen come up and said 103days 40hrs to dl the god darn Lion (note I have Lion installESD.dmg stored on Drive B, is it possible to access that and install from drive B?)
8. Can't seem to find the Lion Recovery partition, how can i boot into that? When hold Command-R, it boots into Internet Recovery for 15 misn then go back to the choose languague and the 4 options (restore from TM, Reinstall OSX, Disk Util and somethign else I can't remember)
Basically I want to either restore from my TM back up to current state or re-install new OS X to the MacHD without wiping out the whole drive.
Thanks for your help.

Yes, but you would need to erase/reformat the hard drive to re-install Snow Leopard.
Star with Section E in the first linked article.
Time Machine Troubleshooting
Time Machine Troubleshooting Problems

Unable to boot after Time Machine full system restore!!

I was having some serious slowdowns with my computer. I did multiple RAM and HD hardware tests, everything seemed to be working fine. I had recently deleted a bunch of files in order to free up some HD space, so I thought that may be the culprit. So I did a Time Machine backup and restored the Powerbook to it's original 10.3 software. All was fine. Then I upgraded back to 10.5 and all was fine. Then I did a Time Machine full system restore overnight and got the message "Your restore was successful, you must now restart your computer" (or something to that effect). Now I get the start-up chime and startup screen (apple logo) but then the computer shuts itself down. I have reset the PMU and PRAM to no effect. I have tried booting up in safe made, also no dice. I have tried starting it up with the time machine HD attached - doesn't help. I guess I'll need to hit the genius bar but wanted to ask the friendly discussion forum folks first. thanks in advance.

Hi coldengray
Did you try to start from your System-CD? Hold down C-key during startup, start DiskUtility from the menu and verify/repair disk and permissions there.
If the CD is not available you can also connect your TimeMachine-Disk, select it as startup volume in System Preferences/StartupDisk, restart and then run DiskUtility from folder Applications/Utilities
Good luck P

Since I upgrade to Mavericks, I am unable to back to Time Machine. I receive this error message -The disk image "computer name.sparsebundle" is in use. Try ejecting the disk image

anyone have any suggestions how to fix this. I have looked around but do not see this specific error message on any of the discussions. Also, very little information regarding mavericks

I am using Time Machine, but it an external drive that is connected to Airport Express with a USB through a hub

Unable to re establish Time Machine connection with Machine A

Hello,
Time Machine was working on machine A. I was able to go into time machine, look at the files in my backup and restore a file if I needed to.
My machine A was out of service due to a power supply and I used a Machine B to access my time machine files. Machine B had 2 userid's. Both users were ADMINISTRATORS. The 2nd user ID was able to SEE the files, I was NOT ABLE to RESTORE. (insufficient privileges). The 1st user ID. I was able to restore and discovered this by accident. I restored what I need to and was able to work off a laptop until Apple fixed my machine A (it took 7 days)
Problem:
When I got my workstation back I plugged in the hard drive that contains my backup and figured...I am off and away just as before.
1. I was not able to get TIME MACHINE started. ( I cannot recall the series of steps)
2. Now when I select time machine the menus offers me...
BROWSE OTHER TIME MACHINE DISKS
OPEN TIME MACHINE PREFERENCES.
When I select browse the 1st item, I am not even able to see the backup that was there.
When I select the Open Time machine preferences, I cannot figure out how to re - attach the time machine backup that I used to have connected to this workstation.
Thanks in advance for your assistance.

Hello Scott,
I tried a sudo cmd from the terminal application and wound up with the same error.
Prior to runnin this cmd, I managed to borrow an external hard drive and backed up all of the data I needed in case the sudo cmd did something to prevent me from seeing data on my hard drive.
Sudo cmd did not work. Time Machine was giving me the same access errors.
Since by now I had made a back up of my data to another hard drive,
I reformatted my original external hard drive.
I went back to time machine and selected the external drive I just reformatted
I received the same error again, but about 30 seconds later, Time Machine responded with ....the drive has been selected for back up and about 90 seconds later, Time Machine initiated and is starting a backup in the background.
To summarize
Prior to doing the sudo command (I am a little cautious about doing things I have no idea what the end result will be....)
I backed up the external drive A to external hard drive B
used Deja Vu to perform an entire system back up of my workstation as well as another one of everything in my USERID
I tried the sudo command...when it failed
Reformatted external drive A
Time Machine is now working again
Thanks for your comments and feeback. Between your comments and VK was enough for me to put together the pieces and decide on a course of action.
I would recommend to anyone reading this to always back up as the safest course of action

Unable to restore previous time machine backups

Time machine has been turned off since February.
I want to restore some missing emails which are in the february back up. Before doing this i turned time machine back on to get a recent backup.
I was able to browse the february backup up files fine in time machine after the back up completed.
Today I have went to restore the emails from February but I am finding that once in time machine I cannot access the backups from February.
I can see the dates down the right hand side but when i click on them nothing happens.
I can see the backups folders from February in finder on the time machine disk.
Any ideas?
Thanks,
Scott

Some reading, but very useful info. Worth bookmarking too.
Pondini FAQ
http://pondini.org/TM/ Troubleshooting.html

I am unable to set my WD mybook world edition (white light) for time machine.

I have new iMac running OS X Mavricks 10.9 and a WD mybook world edition (white light) connected via eithernet to router.
I am unable to set up time machine using this drive.
I can see the MyBookWorld drive in Finder and read and write files with no problems. I can also see the MyBookWorld_Backup drive but I am unable to connect.
Time machine can see the drive but when I select, use drive, it trys to connect and gives me an error message: There was a problem connecting to the server "MyBookWorld-Backup"
I have already updated the hardrive firmware.
Any ideas?

WD and their lack of support for Mavericks:
A recent email from WD reads:
Dear WD Registered Customer,
UPDATE: November 1st, 2013
As a valued WD customer we want to make you aware of new reports of Western Digital and other external HDD products experiencing data loss when updating to Apple's OS X Mavericks (10.9). WD is urgently investigating these reports and the possible connection to the WD Drive Manager, WD Raid Manager and WD SmartWare software applications. Until the issue is understood and the cause identified, WD strongly urges our customers to uninstall these software applications before updating to OS X Mavericks (10.9), or delay upgrading. If you have already upgraded to Mavericks, WD recommends that you remove these applications and restart your computer. If you have already upgraded to Mavericks and are experiencing difficulty in accessing your external hard drive, please do not save anything to the drive, disconnect the drive from your computer, and contact Western Digital Customer Service at http://support.wd.com/country/ for further assistance.
The WD Drive Manager, WD Raid Manager, and WD SmartWare software applications are not new and have been available from WD for many years. However, solely as a precaution WD has removed these applications from our website as we investigate this issue.
Sincerely,
Western Digital
Which is basically Western Digital informing you that their out-of-date utilities don’t support Mavericks.
In any case those utilities are not the most effective. The moral of the story is: the first thing you should do after buying a WD drive is to format it as HFS Extended (Journaled) and not install ANY of their utilities but instead use reliable applications like CarbonCopyCloner or SuperDuper - or Time Machine.

Time Machine can no longer write to drive

I have been using Time Machine to back up my iMac G5 for over a year. About two weeks ago the computer started acting really strange so I actually restored the entire system from my Time Machine backup. Everything was working great until today. The external hard drive that I've been using all this time is suddenly "read only". How do I change it back to "read/write" so Time Machine can access the hard drive properly?

BobMeister wrote:
I have been using Time Machine to back up my iMac G5 for over a year. About two weeks ago the computer started acting really strange so I actually restored the entire system from my Time Machine backup. Everything was working great until today. The external hard drive that I've been using all this time is suddenly "read only".
It's very important to know exactly what you or the computer was doing just before this happened. Usually, things do not happen on their own.
How do I change it back to "read/write" so Time Machine can access the hard drive properly?
Changing it back when it's not clear why it changed in the first place is not always a good thing to do for several obvious reasons.
Right-click on the TM drive icon and select "Get Info"
Under Sharing & Permissions, you should see:
Your name (Me) Read & Write
(unknown) Read & Write
everyone Read only
Post back what you see and we can attempt to proceed.

Unable to write to time machine...

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