Today I’d like to discuss some differences with backups and retention between on-prem and Azure. With on-prem we’re used to having the ability to backup our databases to local storage, such as a PaaS device, if we have storage available to do that.
In the cloud, we have a limited number of backups that we’re provided from a retention period perspective. For instance, for SQL database we have Point in Time recoveries but our retention period for our backups is defined based on our service tier. A basic service tier provides 7 days of backup retention. Standard or premium tiers allow up to 5 weeks of retention for database backups.
We can enable a long-term backup (LTR) solution and this allows us to take our weekly backups and save them for up to 10 years, although there is a cost for this.
With Azure SQL Data Warehouse, we have 7 days of backup retention. Our local snapshots that are done automatically for us will take place every 4-8 hours. We also get a full snapshot backup done daily and the RPO around our geo backups is 24 hours. Something recently added to SQL Data Warehouse is we can take up to 42 user defined snapshots. The benefit here is we don’t have to wait for the local snapshots to take place through the Microsoft scheduling behind the scenes.
Hence, if we’ve completed a substantial load process, we can take a user defined snapshot, start this load and make sure that our data is covered, so if we must do a recovery, we know that it will cover that load processing.
Azure Databases for MySQL and PostgreSQL have 7 days of retention by default. However, these are configurable to up to 35 days of retention. Both have Point in Time recoveries and geo restores from the backups being retained for us.
Something to note, once you get over 250 gigs worth of data, you start incurring data charge for storing within the 7 or 35 days of retention.
As we move to the cloud we need to think a little differently and the processes are going to change a bit, but the benefits far outweigh the risk or fears of change.
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