Hi, my sons treats his Macbook in such a way that he usually walks off from it 
mid Time Machine backup and then closes the lid which interrupts the back up. 
His bedroom is also in a poor wifi spot (which I am separately resolving) which 
makes any backup exceedingly slow. I checked his MBP the other day and it said 
last backup was a month ago - obviously a time where he had it open for a 
period of time which allowed the backup to complete. 

The other night he was copying some content (all five days recorded of the 
first test match!!!) from another connected USB drive (via his MBP to his 
external drive). At the time of this transfer, the Time Machine woke and 
started it’s backup - and the size of the backup was enormous (~100GB). We 
selected “Skip this Backup” and then turned off TM. After the Test Match 
transfer was completed, we turned ON the Time Machine again and thought nothing 
more of it, leaving it to its own devices to pick up the next backup.

It wouldn’t backup at all and a couple of days went by still saying the last 
back up was some time prior to the test match file transfer. Tonight I shutdown 
his MBP, reset the full network and then restarted the MBP. It took an age 
saying “Waiting for first backup” and then Preparing Backup as expected, then 
after I had to go out and came back, it said backing up 540GB!!! The same as 
the full sized backup of what it was prior. The Test Match files are in an 
Excluded folder on the external drive so do not form a part of this 540GB 
backup. I can see the backup file is ‘in use’ by looking from  another network 
connected MBP at the file. I have let it go for now but half of me says 
intervene, blow away the old backup band start again so he doesn’t end up with 
a backup files twice the size it needs to be.

It will take a full 24 hours to get through this 540GB Backup but I am not sure 
if the resultant backup file will in fact be 1080GB in size, fortunately the 
backup disc is a 2TB size so has the space. 

Should I intervene, blow away and start again or let it finish?

Regards


Pete
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