Hi,
I'm about to migrate my 2009 iMac to an iMac Pro. The main system HD is 4Tb w/ 1.47 Tb Used. When I did a full TS backup it was 3.55GB, and that was with the latest backup. Why more then double the main HD ??? Anyone have an Idea on this??
Best regards,
Andrew
As unintuitive as it might seem, you cannot directly compare disk utilization on a Time Machine drive to the source system. That's because of the way Time Machine stores its point-in-time backups.
Each snapshot (of which there can be many per day) is really a diff from the previous one, so will depend heavily on the amount of data that is changing between each backup. If you change large files (such as video files), these will consume a larger amount of your backup drive (for example, you may have several copies of that 100GB movie file on your backup drive as you've worked on it over the day, even though you only have one file on your system drive).
That said, doubling the host system's drive seems like a lot for the first day's backup, but I still wouldn't worry about it. Time Machine has proven to be quite resilient in my experience and I just let it do its thing.
As unintuitive as it might seem, you cannot directly compare disk utilization on a Time Machine drive to the source system. That's because of the way Time Machine stores its point-in-time backups.
Each snapshot (of which there can be many per day) is really a diff from the previous one, so will depend heavily on the amount of data that is changing between each backup. If you change large files (such as video files), these will consume a larger amount of your backup drive (for example, you may have several copies of that 100GB movie file on your backup drive as you've worked on it over the day, even though you only have one file on your system drive).
That said, doubling the host system's drive seems like a lot for the first day's backup, but I still wouldn't worry about it. Time Machine has proven to be quite resilient in my experience and I just let it do its thing.
Sorry I meant TM, This is a new 4tb HD to do a TM backup. Before it started it said TM needs 3.55TB for backup. When I did the TM B/U it had 3.55Tb used up...it essentially is setting up as a TM drive, the drive had a number of backups from the same day...could that be it? Any help would be great
Thank you for the response, I understand, the issue is I’ll be using this to migrate to another iMac and it’s way to much hard drive space. How do I consolidate?
When you restore, or use Migration Assistant, it will not duplicate your backup to your destination. It will restore the current state of the backup. It will "consolidate" for you.
So, I made a new Time Machine drive 3.5Tb of files from my older iMac where loaded on to the disc, Restored to the new iMac and 3.5Tb are now loaded on the new iMac. There where 6 backups on this disc all the same day, I picked the last one.
Can anyone clarify or help?
Thx
Hi,
Thank you for everyones input!!! I spoke to Apple with screen share, I truly have 3.55Tb....Yes you are all correct thank you! Sorting though the storage to see what I can purge.
Thank You all again!!
-Andrew
On the older iMacs 4tb HD it shows 1.47tb is available.
Andrew, what is TS?
Were there other/earlier backups on the TM Drive?
Thank you for the response, I understand, the issue is I’ll be using this to migrate to another iMac and it’s way to much hard drive space. How do I consolidate?
thank you,
Then you had 3.5 TB of data on the original drive.
How large is the drive on the new Mac? It would be difficult to put 3.5 TB of data on a 1TB drive.
iMac Pro has 4tb SSD
Time Machine Backup is double the main Macintosh HD size used
