My testing:
I have gone through and been testing the new Synology Hyperbackup package - 4.1 update with a DS923+ (4x 4TB HDD RAID 5) backing up to a DS1522+ (3x 8TB HDD RAID5) over a 10GbE connection. I started by creating 1 million 1mb files that were random data (it was the same random file, but copied 1 million times, more on this later)
Backups Done
Hyperbackup 4.0
Hyperbackup 4.1
Hyperbackup 4.1 Full System
Performance data:
disclaimer: this was not a perfect test, I did my best but there is a flaw in the fact that I used the same random file for all 1 million times
First Backup times:
Hyperbackup 4.0 - 3h 16m
Hyperbackup 4.1 - 2h 56m
Hyperbackup 4.1 Full System - 1h 17m*
Note: Turns out that full system backup does deduplication, not sure how this would effect the overall time
Second Backup Times:
this was done where there was no changes to the files
Hyperbackup 4.0 - 3m 2s
Hyperbackup 4.1 - 2m 40s
Hyperbackup 4.1 Full System - 3m 13s
Third Backup Times:
This is where the 1 million 1mb files where modified to a very small text file (single sentence) then backed up again
Hyperbackup 4.0 - 6m 17s
Hyperbackup 4.1 - 5m 43s
Hyperbackup 4.1 Full System - DNF *
This failed on multiple attempts to backup DNF (more on this when the video comes out)