Using rsync in the normal way copies the entire blockchain to backup every time new blocks are added. To get around this, I used the --append flag, however even though the size of the backup is the same as the newly updated blockchain, if I run monerod connected to the backup, it does not show the backed up blockchain as synced. So, is there a way to back up my blockchain incrementally in a way that the backed up blockchain will be usable and correctly synced?
This post does not give a correct answer as that simply copies over the whole blockchain every time that rsync command is run, which does not help at all.