Incremental backups with mongodump and mongorestore

readme.txt

Note:

Oplog should be big enough from the last full backup till the next backup so that mongodump can copy all the changes happened from the last backup.
Also, this is an experimental way of doing backup and restore, not thouroughly tested.

Mongorestore:

mongorestore -h localhost --oplogReplay --port 27017 --oplogFile=backups/incremental/oplog.bson --dir backups/base

base_backup.sh

#!/bin/bash

New_DATE=$(date +%s)
mongodump -h localhost --port 27017 -o backups/base
Old_DATE=$(cat query.js | awk -F: '{print $5}' | cut -c 1-10)
awk -v old="$Old_DATE" -v new="$New_DATE" '{gsub("\"t\":" old ",", "\"t\":" new ",")} 1' query.js > temp.js && mv temp.js query.js

incr_backup.sh

#!/bin/bash

rm -rf backups/incremental
mkdir -p backups/incremental/
mongodump -h localhost -d local -c oplog.rs --queryFile query.js --port 27017 -o - > backups/incremental/oplog.bson

query.js

{"ts":{"$gte":{"$timestamp":{"t":0000000000,"i":1}}}}