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→Performance: records performance stats
Backup up ~60 GB of data across a USB 1 interface using rsync and -z for compression will take over 1 day. In fact it will take over 10 minutes to generate the file list. My experience was with 874,490 files.
Similarly, if you are backing up across a network, then you can get dramatically slower results than if the source and target are local. For example, in my most recent backup, I was able to copy 18GB over a wireless network but it took 43,712 seconds (over 12 hours). 19GB over a local USB2 interface took 1,037 seconds (17 minutes).
In most backup scenarios, the first backup is the one that takes the most time.