Hello!

Opinions, please.

I use rsync to copy my primary backup drive to a secondary backup drive
, so that the secondary backup drive is theoretically always an exact
copy of the primary backup drive.  

Here is the rsync command I use:

time sudo rsync -aAXHxvv --delete-after --numeric-ids --
info=progress2,stats2,name2 --
exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/mnt/*","/media
/*","/lost+found"} /media/default/MSD0001/ /media/default/MSD0002/

Question: 
I use rsync --delete-after because it might seem to be "safer", so in
case of a "glitch" of any kind, no file ever disappears from both the 
source drive and the destination drive.  

However, I have read that using rsync --delete instead of rsync --
delete-after is faster and uses less memory, and so is more efficient. 

Note: The current copy process time varies, but takes a long time -
last night 131 minutes.
:(

Disk space used is not currently an issue.

But, is rsync --delete AS SAFE as rsync --delete-after?


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