I have started to play with different aspects of backup of a Couchbase server.
First I did a full backup using:
/opt/couchbase/bin/cbbackup couchbase://db1.zzz.dk:8091 /home/couchbase/backup -b data -u xxx -p yyy
Two days later I did a “diff” backup using:
/opt/couchbase/bin/cbbackup couchbase://db1.zzz.dk:8091 /home/couchbase/backup -b data -m diff -u xxx -p yyy
Now I can see that they take up equally much space on the disk. So to me the “diff” backup really looks like full backup:
I guess the idea of making a diff backup is to create a smaller backup set. So either I misunderstand the purpose of the “diff” backup of a Couchbase server - or I did it wrong 
Any feedback much appreciated 
I’m using: Community Edition 6.0.0