Data backup strategies8/8/2023 ![]() Sounds efficient from a data protection perspective right? ![]() Incremental backup only backup what was changed since the last backup. So, there could come a point where a daily differential backup is taking as much time as a full backup (or perhaps more).Įnter the next innovation – incremental backup. After all, they’re backing up all changes since the full backup. The secret is something called cataloging.īut if you think about it, differential backup has the potential to keep getting bigger and take longer and longer each day. Fast incremental backups and fast restores. If you’re able to start the restore from a recent full backup, then the number of subsequent backups to restore and overlay on top of it are limited – thus saving time.īut modern, enterprise-class backup technology has progressed further than this – and will allow you to have the best of both worlds. The idea is to ensure that you’re able to keep restore times in check. It is for this reason that traditional types of backup strategies recommend doing a full backup at frequent points in time – weekly, monthly, quarterly, yearly, etc. So, while we have been able to improve backup speeds progressively, we have traded off restore times in each of the above cases. If you wish to get back the latest copy of data, it’ll take us 80 mins to restore – that 40 + 20 + 20. When you restore data, just like in the previous case – you’ll need to restore the Full backup first – and then layer in each incremental backup on top of that – in order. ![]() Why did we backup E? Remember a differential backup picks up everything that changed since the full backup. When you run the backup on Day 3, it’ll backup 3 files (B2, C1, and E) and it’ll take you 30 mins.File C also changes to C1 and File D gets deleted. One Day 3, let’s say File B changes again and becomes B2.When you run the backup on Day 2, it’ll backup just the 2 changed files and the backup will take you 20mins.On Day 2, let’s say File B changes to B1, and a new File called E is added.And let’s say each of them is about 1GB each and each of them takes 10 mins to backup Let’s take the same example – say you have 4 files A, B, C, and D. Differential backup makes a copy of files that have changed since the full backup. The next optimization the industry made was a differential backup. 40 minutes – 50 minutes each day as in our example. When you run the backup on Day 3, it’ll backup 4 files again (D is removed – remember?) and it’ll take you 40 mins.įull backups, as you can see take time.File C also changes to C1, and File D gets deleted. hen you run the backup on Day 2, it’ll backup all 5 files and it’ll take you 50mins. ![]() ![]()
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