Just chiming in here,

I haven’t read all the previous posts so may be repeating…

Mike Bombich has a good piece on benchmarks for various source/destination 
scenarios with rsync.

https://bombich.com/kb/ccc3/how-long-should-clone-or-backup-take

Note that copying to sparsebundle on local media is as fast as to local disk. 
Sparsebundle is a mac filesystem whereas NAS is not so certain file metadata 
are not covered like Hard links,Acls and groups and owners. So it is important 
to turn off those rsync options to scan those file parts on NAS. But 
sparsebundle on NAS is ok for HFS options.

Network backups are always slower but you can see that sparseimage on network 
volume (AFP) is better according to Mike’s chart.

I also develop an rsync based backup app (backupList+) and some users have 
reported very slow times even to sparse images on NAS but I am not the expert 
Mike is on these matters. Network issues vary for sure….

Cheers,  Rob






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