Hi,

If the site is taking weeks to process its incremental, I’m going to suspect the number of files on the site exceeds the number recommended by Microsoft. Microsoft best practice documentation for SharePoint states to not exceed 300k files per SharePoint site. When the 300k number is exceeded, there are some delta APIs that don’t work. Meaning that we can’t query Microsoft and ask for a list of only changed data to backup. Instead we have to manually query each file to see if it has changed. This burns through API calls as if it were a full backup each time.

Id recommend you look at the number of files within the site and split these out into different sites if possible.

Hi ​@MicoolPaul 

Noted. 

Number on Items Processed mean number of files processed? Can i say from 17/03/2025 to 21/04/2025 the VDC backup 235209 SharePoint files?

We say items instead of files because if we’ve got mailboxes in the job then it also counts emails etc.

If it’s only SharePoint in the backup job then yes it’s the number of files backed up during that job run

Hi ​@hs08 ms throttling is the main reason for the slow backup of large SP sites in VDC to improve performance, use multiple app registrations (up to 4), split large sites into smaller parts, and schedule backups during off-peak hours.  

hi ​@waqasali 

use multiple app registrations (up to 4)

how we can use 4 app registration as i know VDC only support up to 2 app registration.