Resolved Time machine Backup Query

[MarkC426]

Just got a 2tb HDD to replace my 1tb iTunes drive (which is almost full).
Am I right in saying if I name the new drive same as old, time machine won’t start the backup again, it should carry on as normal when there is a change.

 

[MarkC426]

Well I answered my own question, just cloned my iTunes drive.
Put it into the same bay, with the same name, and TM wants to copy 900gb to the next backup..... ?

Is there something telling my mac it is a new amount of data to be backed up?
Still got space on my TM for this but thinking might format and start it again.

 

[Soba]

Well I answered my own question, just cloned my iTunes drive.
Put it into the same bay, with the same name, and TM wants to copy 900gb to the next backup..... ?

Is there something telling my mac it is a new amount of data to be backed up?
Still got space on my TM for this but thinking might format and start it again.

What method did you use to clone the drive?

 

[MarkC426]

I tried TechTool Pro first but it failed Immediately.
Used superduper to copy it.

 

[Mattww]

I've moved backup disks like this before but even though you clone the data to a new disk it will end up seen as different by Time Machine as it will have a different UUID. You therefore need to use the command line Time Machine features and first associate the old backups on the new drive. for details how see here:

https://simon.heimlicher.com/articles/2012/07/10/time-machine-inherit-backup-using-tmutil/

 

[MarkC426]

Thanks dude, but that looks far too complicated for me......
I think my setup is a bit more complicated, I have my system drive and 3 other data drives all backing up to TM (Thinking all this associating may mess other drives up).
Everything is cloned to external drives so no worries.
May do a new TM from scratch.

 

[Mattww]

It is actually quite simple - you only need one command and it will still backup exactly what you were backing up before. I have several internal drives in my machine that are all backed up with Time Machine too.

This link may explain it better:

https://www.baligu.com/pondini/TM/B6.html

All you are doing to pointing it to the existing backups you cloned onto a new disk so it can just add to them again as usual rather than starting all over again.

 

[MarkC426]

Sorry, it is not the TM that has been cloned, it’s the data drive has moved to larger capacity.

 

[Mattww]

OK that is covered too at the last link - see the box ""Associate" a data-only volume".

 

[MarkC426]

Tried to drag the new drive from finder and it‘s detached now.
how do I get it back into the finder window with the other drives?
edit: got it back.
how do you drag to terminal without detaching.

 

[Mattww]

Sounds like you just accidentally dragged that drive shortcut out of the Finder Window sidebar so just use the "go" menu and go to "Computer" and then drag it back to the side bar.

 

[MarkC426]

U R A ⭐
Thanks, that worked perfectly.......?

 

[Mattww]

No worries - pleased you don't need to backup GBs again needlessly. It is worth bookmarking that page with the commands - I always forget the commands and then swap another disk months or years later and need them again.