I have a 512GB Android phone with 150GB+ 15k+ photos and videos.
Step 1. On my Macbook, I used better-adb-sync with a USB cable and debugging enabled to copy a large amount of files from my phone to my Macbook's disk...DONE
adb-sync -Rdt /sdcard/DCIM/ ~/Documents/phone/AndroidPhone/DCIM
Step 2. Now after a month or two, I want to sync the phone with the disk again for the additional new photos. Now, I don't want to use the cable and turn on the debugging, etc. as the number of files is not much, so I want to use the rsync tool over WiFi with SimpleSSHD.
The problem: On the Macbook terminal, when I run the rsync command below,
rsync --delete -azuvPe 'ssh -p 2222' 192.168.1.3:/sdcard/DCIM/ ~/Documents/phone/AndroidPhone/DCIM
Instead of finding the incremental of new files in the phone quickly and copying them to disk, the output is showing to be copying all the files again which already exist on disk and even the date-time stamps of files are exactly the same.
This syncing is taking hours and hours to complete. This thing, I believe will be happening the first time only and may not happen the 2nd onward incremental backing process from phone to disk.
But I want to know what is happening and why.
I expect rsync to compare and diff the 2 folders and determine initially what new files to copy from the phone to disk and delete from disk what has been deleted from the phone based on size and timestamps (pre-processing), and then simply copy the new incremental extra files even if it is the first time of processing the rsync command.
How can I make this work the above way? Any flags I can pass to ignore some parameters, etc.?