New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

 
Start a Discussion
 

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

Join the conversation RSS
OS X - Operating System General OS operation information and support

Time Machine deletions when the disk is full


Post Reply New Thread Subscribe

 
Thread Tools
Mikethebook

 
Member Since: May 29, 2009
Posts: 166
Mikethebook is on a distinguished road
Mac Specs: Mac Mini 2.26Ghz 2GB RAM

Mikethebook is offline
I would like some clarifications regarding how Time Machine goes about deleting files when the external drive is full. At the outset if one has backed up everything including system files, does this mean that they will go first, the actual operating system, or does it delete the earliest versions of currently existing files? Can anyone enlighten me please? Thanks. I've just been rebuilding my Mac and am wondering whether to backup just documents or the whole system.
QUOTE Thanks
TattooedMac

 
TattooedMac's Avatar
 
Member Since: May 19, 2009
Location: Waiting for a mate . . .
Posts: 7,882
TattooedMac has a brilliant futureTattooedMac has a brilliant futureTattooedMac has a brilliant futureTattooedMac has a brilliant futureTattooedMac has a brilliant futureTattooedMac has a brilliant futureTattooedMac has a brilliant futureTattooedMac has a brilliant futureTattooedMac has a brilliant futureTattooedMac has a brilliant futureTattooedMac has a brilliant future
Mac Specs: 21" iMac 2.9Ghz 10.9.4 13"MBP 2.9Ghz i7 Yosemite 10.10 ~ iPhone5 iOS 8 ~ iPad Mini iOS 8 ~ ATV3 6.1

TattooedMac is offline
Time Machine basically, once you Ext is full, it will start deleting backup's from the very 1st time you did it. Then the next and so on. So if you did your 1st backup 1/3/2009 @ 1015am and then every hour after that it will delete 1/3/2009 @ 1015am, then 1/3/2009 @ 1115am, then 1/3/2009 @ 1215pm and so on.

Does that make sense ??

TM

Dont forget to use the Reputation System if someone has helped you out !!!
Arguing with a zealot is only slightly easier than tunneling through a mountain with your forehead!!!!!
MoTM ☆☆☆
QUOTE Thanks
bobtomay

 
bobtomay's Avatar
 
Member Since: Dec 22, 2006
Location: Texas, where else?
Posts: 25,182
bobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond repute
Mac Specs: 15" MBP 2.33 C2D 256 4GB, MBA 13" i7 1.8, MB 2.0 2GB, Nano 4th, 3GS, iPad 1

bobtomay is offline
(Edit - deleted this line since I didn't know what I was talking about.)

It deletes the oldest backups first - by date. Everything in the oldest backup.

If you have a habit, as some do, myself included - of moving a lot of files on and off your machine that don't need to be backed up to TM, exclude the folders those type of files go into from the backup.

Ex. I exclude the downloads folder. I download and run a ton of apps without actually installing to test them out and having all of them backed up would be a waste of space.

I cannot be held responsible for the things that come out of my mouth.
In the Windows world, most everything folks don't understand is called a virus.
QUOTE Thanks
Mikethebook

 
Member Since: May 29, 2009
Posts: 166
Mikethebook is on a distinguished road
Mac Specs: Mac Mini 2.26Ghz 2GB RAM

Mikethebook is offline
Thanks guys. That helps.
QUOTE Thanks
chas_m

 
chas_m's Avatar
 
Member Since: Jan 22, 2010
Location: Victoria, BC
Posts: 17,498
chas_m has a reputation beyond reputechas_m has a reputation beyond reputechas_m has a reputation beyond reputechas_m has a reputation beyond reputechas_m has a reputation beyond reputechas_m has a reputation beyond reputechas_m has a reputation beyond reputechas_m has a reputation beyond reputechas_m has a reputation beyond reputechas_m has a reputation beyond reputechas_m has a reputation beyond repute
Mac Specs: 2012 MBP, Black speakers, Black Benq second monitor, black(ish) iPhone 5s, Black 2012 iPad, etc.

chas_m is offline
Quote:
Originally Posted by bobtomay View Post
TM does not back up all the system files. It does back up your preference files.
Bob, I'm not sure I'm understanding you, but as I read you, this is not correct.

Time Machine backs up EVERYTHING. Applications, system files, preferences, user data, photos, music -- EVERYTHING that is on the hard drive, including invisible files. Every last byte of it (file-by-file not sector-by-sector, but still).

It then adds an "iteration" of what's changed. So if your original state of the hard drive can be expressed as "A", and whatever has changed since then can be expressed as B, then the 2nd backup is A+B1, 3rd backup is A+B2 and so forth.

Time Machine doesn't actually *ever* delete the original backup (the "A" state). It deletes the oldest "B" states. The only time the "A" state gets erased/replaced is when a new "A" state is created (by changing the hard drive substantially enough like by a system update). This is why Time Machine doesn't "recognise" your hard drive when you upgrade from Leopard to Snow Leopard and you have to do a new full backup.

Time Machine conserves space by folding the hourly updates into a daily update after 24 hours. After 30 days, it folds the oldest daily backups into a weekly backup. These weekly backups are what start getting deleted (oldest first) after the hard drive gets close to full. The A state is left untouched.

Hopefully that clarifies things a bit.

PS. Your suggestion to exclude certain "busy" folders such as the download folder from TM is a particularly good one.
QUOTE Thanks
louishen

 
louishen's Avatar
 
Member Since: Oct 22, 2007
Location: London
Posts: 8,951
louishen has a brilliant futurelouishen has a brilliant futurelouishen has a brilliant futurelouishen has a brilliant futurelouishen has a brilliant futurelouishen has a brilliant futurelouishen has a brilliant futurelouishen has a brilliant futurelouishen has a brilliant futurelouishen has a brilliant futurelouishen has a brilliant future
Mac Specs: Mac Mini Core i7 2012 | White 2009 MacBook 2 Ghz | 733 Mhz G4 Quicksilver

louishen is offline
As well as excluding your downloads folder, you can also free up more space by deleting unwanted files, for instance - I regularly delete all back-ups of my Virtual Box windows disk, deleting all old copies and safe in the knowledge the latest copy will get backed up on the next TM back-up.
Attached Images
File Type: jpg TM-del.jpg (40.3 KB, 7 views)

Member of the Month September 2008 & August 2012 | Found advice useful? use the rep system
QUOTE Thanks
Mikethebook

 
Member Since: May 29, 2009
Posts: 166
Mikethebook is on a distinguished road
Mac Specs: Mac Mini 2.26Ghz 2GB RAM

Mikethebook is offline
Thanks for the info. Given my external drive is not large and I can't yet run to a new one, maybe I'd be best just backing up documents etc and also doing a regular save to something like Carbon Copy Cloner.
QUOTE Thanks
bobtomay

 
bobtomay's Avatar
 
Member Since: Dec 22, 2006
Location: Texas, where else?
Posts: 25,182
bobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond reputebobtomay has a reputation beyond repute
Mac Specs: 15" MBP 2.33 C2D 256 4GB, MBA 13" i7 1.8, MB 2.0 2GB, Nano 4th, 3GS, iPad 1

bobtomay is offline
I stand corrected - again - what else is new.

Now it seems to me even more silly that you have to install the OS before you can restore.

I cannot be held responsible for the things that come out of my mouth.
In the Windows world, most everything folks don't understand is called a virus.
QUOTE Thanks

Post Reply New Thread Subscribe


« How long did your update take? | Can NOT boot into Mac OS please help! »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
Hard disk and Time Machine issue public_life Other Hardware and Peripherals 3 02-05-2010 02:33 PM
Airlink with Time Machine Disk dies cadence Internet, Networking, and Wireless 0 01-27-2010 02:18 AM
What is up with Time Machine? xcapepr OS X - Operating System 0 01-27-2009 06:16 PM
time machine error - never stops to prepare or stopping back-up alonewithmymac OS X - Apps and Games 3 12-26-2008 08:56 PM
Time machine on air disk kiketi OS X - Apps and Games 0 02-07-2008 08:11 AM

All times are GMT -4. The time now is 09:00 AM.

Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
X

Welcome to Mac-Forums.com

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!


(4 digit year)

Already a member?