可以用mongodump来做MongoDB 的库或表级别的备份，下面举例说明:
备份my_mongodb数据库

[root@localhost bin]# ./mongodump -d my_mongodb
connected to: 127.0.0.1
DATABASE: my_mongodb     to     dump/my_mongodb
        my_mongodb.system.indexes to dump/my_mongodb/system.indexes.bson
                 1 objects
        my_mongodb.user to dump/my_mongodb/user.bson
                 2 objects
[root@localhost bin]# ll
总计 67648
-rwxr-xr-x 1 root root 7508756 2011-04-06 bsondump
drwxr-xr-x 3 root root    4096 04-10 23:54 dump
-rwxr-xr-x 1 root root 2978016 2011-04-06 mongo

此时会在当前目录下创建一个 dump目录，用于存放备份出来的文件 也可以指定备份存放的目录，

 [root@localhost bin]# ./mongodump -d my_mongodb -o my_mongodb_dump

connected to: 127.0.0.1
DATABASE: my_mongodb     to     my_mongodb_dump/my_mongodb
        my_mongodb.system.indexes
my_mongodb_dump/my_mongodb/system.indexes.bson
                 1 objects
        my_mongodb.user to my_mongodb_dump/my_mongodb/user.bson
                 2 objects
[root@localhost bin]#

数据恢复

[root@localhost bin]# ./mongorestore -d my_mongodb my_mongodb_dump/*
connected to: 127.0.0.1
Wed Apr 11 00:03:03 my_mongodb_dump/my_mongodb/user .bson
Wed Apr 11 00:03:03      going into namespace [my_mongodb.user]
Wed Apr 11 00:03:03      2 objects found
Wed Apr 11 00:03:03 my_mongodb_dump/my_mongodb/system.indexes.bson
Wed Apr 11 00:03:03      going into namespace [my_mongodb.system.indexes]
Wed Apr 11 00:03:03 { name: "_id_", ns: "my_mongodb.user", key: { _id: 1 }, v: 0 }
Wed Apr 11 00:03:03      1 objects found
[root@localhost bin]#