Any correct procedure for couchbase backup and restore? I have just started using couchbase server and trying to configure backup and restore method. We require to take backup for each couchbase node or cluster backup also available ?
Some recommendations from the professional services team at Couchbase:


Use cbbackupmgr to take differential backups (according to your recover point objectives).
Merge backups to the number of restore points that you want.
Compact the backup set after each backup operation


Some references for you:


cbbackupmgr tutorial
cbbackupmgr strategies