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Why do Time Machine backups look like this?
Posted by: freeradical
Date: August 25, 2021 09:36AM
I started using TM yesterday, which I have never done before. I always used to strictly rely upon clones.

There are now seven backups showing in my TM drive. Each one is something like 97 or 98 GB.

However, I show around 900 GB of a 1 TB drive available.

How is this possible?
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Re: Why do Time Machine backups look like this?
Posted by: TheCaber
Date: August 25, 2021 10:25AM
TM uses 'hard links' to point to files that have not changed since the previous back up. A hard link uses no extra storage (just bumps the 'link count' for the file).

When a backup is removed/recycled for storage, the backup tree is walked, each file has its link count decreased by one. Any file whose link count is zero is summarily deleted and its data blocks are moved to the free list for reuse (optionally zeroed before moving, or before reusing).

There may be other housekeeping tasks going on, but this is basically Unix filesystem management (since 1970).



=TC
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Re: Why do Time Machine backups look like this?
Posted by: freeradical
Date: August 25, 2021 10:30AM
Interesting, but confusing looking!
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Re: Why do Time Machine backups look like this?
Posted by: jdc
Date: August 25, 2021 10:48AM
Well, technically there is never a reason to peek inside your TM folder. Its just there, doing its thing. =)





Edited 999 time(s). Last edit at 12:08PM by jdc.
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Re: Why do Time Machine backups look like this?
Posted by: freeradical
Date: August 25, 2021 11:54AM
Quote
jdc
Well, technically there is never a reason to peek inside your TM folder. Its just there, doing its thing. =)


The TM drive appears on my desktop. I can't help myself from looking.

:-)
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Re: Why do Time Machine backups look like this?
Posted by: jdc
Date: August 25, 2021 11:58AM
Easy peasy... one little check box =)







Edited 999 time(s). Last edit at 12:08PM by jdc.
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Re: Why do Time Machine backups look like this?
Posted by: freeradical
Date: August 25, 2021 12:26PM
Quote
jdc
Easy peasy... one little check box =)


Yeah, the problem is that I do want other drives to appear on the desktop.
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Re: Why do Time Machine backups look like this?
Posted by: hal
Date: August 25, 2021 02:27PM
Quote
jdc
Well, technically there is never a reason to peek inside your TM folder. Its just there, doing its thing. =)

this is really good advice - so many here have created problems by messing around in there.
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Re: Why do Time Machine backups look like this?
Posted by: modelamac
Date: August 25, 2021 04:24PM
Quote
freeradical
Quote
jdc
Well, technically there is never a reason to peek inside your TM folder. Its just there, doing its thing. =)


The TM drive appears on my desktop. I can't help myself from looking.

:-)

Rather than peak at the TM drive, enter TM for something that changed in the last day or two, just to prove that TM is working.

Use Disk Utility to determine used and available space. Apple is notorious for misleading used and available numbers everywhere else.



Ed (modelamac)

I think I will just put an OUT OF ORDER
sticker on my head and call it a day.
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Re: Why do Time Machine backups look like this?
Posted by: jdc
Date: August 25, 2021 06:00PM
I was curious and looked in my TM backups folder... and I only have 4 folders?

1) external drive
2) boot drive, data
3) boot drive, system
4) recovery

?





Edited 999 time(s). Last edit at 12:08PM by jdc.
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