Backup strategy is an important part of your dear design. The service you choose for backup will also determine how fast you can recover case of a disaster. Backups also serve other needs, like setting up system close test systems, etcetera. In this section, I will cover the native backup options in Google Cloud and also briefly going to partner solutions that can fulfill specific requirements of specific customers in the area of data management. Let's get back to the big picture overview for a short while, you have learned the Haiti on dear strategies earlier in this module on the previous model. I will now cover the last block on data management on backup. You will learn how Google Cloud lets you take snapshots natively or with partner solutions to back up on restore a sippy systems. At the database level. You will look at some of the features of back contagion for recipe on Google slot that allows you to by pass persistent discs for staging your hana backup volumes. This diagram gives an overview off all backup options for SNP world loads. As mentioned earlier, I will be using a SNP Hana data this as the first example, I'll come back to other databases a little bit later. The application layer consists of a subpoena. Quiver primary additional application servers as well as the ACS CRS instance. Each of these volumes is attached with discs that have volumes that you need to back up. in case recipient hana is that the data and log volumes shared volume and the backups are going into a hanna back up for you. And of course you have the discs for the boot on the application, executable for the hana application itself. On the application layer, you need to back up the volumes for the shade file system reserve, the SAP and the trans interface holders, the transport's and the boat and executable is that run the vegans. One of the most useful back up features in Google Cloud at disc level is pretty snapshots. Alternative backup options are Google's cloud storage buckets as well as Google machine images, so the primary mechanism for backup is pretty snap shots. Pretty snapshots are straight forward, software independent and cost effective way to back up data. Snapshots are taken incrementally at a disk level, and they're automatically compress to keep your storage costs down snapshots or global resources. That means they are addressable from all regions across the globe. In your project, they can also be shared across projects using the shared with PC concept. You can also specify the stories. Location for snapshots has regional or multi regional. Creating a disk from snapshot stored in multi region location is a good option for disaster. Recovery on does not incur network cost as long as the new body created is one of the regions of the multi region group. Compute engine stores multiple copies of each snapshot across multiple locations, eliminating the need for extra replication across regions. A machine image is a computing and resource that stores all configuration meta data permissions and data from one or more discs required to create a fully functional watcher. Machine instruments. You can use a mention image and many system maintenance events, like instance, creation back upon recovery. Instance cloning, etc. Machine images support both multiple and single disk backups. You can use machine image to make copies of instance that contains most of the volumes configurations of the source instance. These copies can then be used for trouble shooting scaling William instances debugging all system maintenance. Machine image collects information on configuration volume, mapping the data on persistent disks from the source instance. However it does not collect information on data in memory data in local assistance and attributes that are specific to the source. Instance such as the name on the IP address. When this snapshots are great option to back up disks in Google Cloud SAP systems typically have more than one disk attached to the serve system instances. So backing up all the disks together with William Configuration using machine images is a great idea for a SAP backups. Beyond backups, GMIs can address several typical use cases in the SAP world. They can also be used for fast SAP instance creation, SAP system cloning, et cetera. You can provision SAP system from a golden image GMI very fast for rapid deployment scenarios. Finally, you can also use GMIs of application service to script out creation of additional applications server instances for scaling to peak load requirements. However, you have to remember that GMIs are also working at block level. So application level consistency of data backed up is not guaranteed. In order to achieve best results, file system quiescencing or freezing is strongly recommended. For SAP HANA Database Backup, you already learned in previous module that Google Cloud offers a free and SAP certified back end the agent SAP HANA. Here are some additional details on this agent. This agent sits inside the VM that holds your SAP HANA System. You can use the HANA administrative cockpit to point your backup directly at the cloud storage bucket. This affords you virtually unlimited storage space since you're dealing with buckets and not predefined disc spaces. The main advantage of using packet agent for backup is the elimination of persistent disks for the back up volume. It works for both scale up installations as well as scale out installations. In the case of scale out, you install the agent in all worker nodes as well as the master node. The agent gives you an average of 600 to 700 megabits of throughput per second. And also it is multi-stream capable, this means you can quickly back up databases that are larger than 128 gigabytes. Multi-streaming considerably reduces the backup time. You can use back end agent to all the three modes of back up, full, incremental and differential. You can also use it to back up logs into the back end. It is certified by SAP on Intel platforms. And supports RHEL, SLES, and it is certified for both HANA 1.0 and 2.0. To complete the discussion on backup options, I will quickly talk about the options for non HANA databases. The options with other databases are similar to those options with SAP HANA. The relevant volumes to back up are database application binaries, root folders and folders that store transactions and log information. Which I generically refer to here as data and log. PD snapshots are still primary native service mechanism for backing them up into Google's log. You can also use non native options backing up both for SAP HANA as well as non SAP HANA databases such as third party network storage shared file systems like Adapt. There are also some niche back up and restore solutions like CommVault and Actifio that you can use. We will look at some off these in more detail shortly. If cost considerations are the driver, we can also think off some clever backup mechanisms. For example, you can create a persistent disc snapshot of a disk, and then deallocate the disk so that you're not paying for the disk anymore. Or in case off non critical systems like sandboxes, you can do a full DB stop, take a snapshot and then restart the DB for the best possible snapshots. Let's talk about partner solutions. NetApp Cloud Volumes is fully managed file storage service that integrates into Google's Cloud Console. To provide a robust set of capabilities for migrating or deploying new SAP installations. The UIs are very similar to persistent disc snapshots. You can use them to set up your scheduling of snapshots that are backed into Google Cloud storage buckets. Currently cloud volume service provide a multi zone availability feature, but not a multi region disaster recovery. Let's have a brief look at some specialist partner solutions in the area of back up and restore. Actifio is a backup and recovery service that is integrated into Google Cloud. You can subscribe to it in Google Cloud marketplace. It has some specific patented features, such as incremental forever data protection. Actifio also claims that the technology creates the smallest backup footprints in the area of SAP backups. It also offers instant rewind and allows you to set up virtual copies for sandboxing and testing. CommVault is another backup and recovery solution. It is popular with enterprises in industries where the data retention guidelines and regulations are quite stringent. It also offers some niche security features and features that support the long term retention of the backup data.
