This content originally appeared on DEV Community and was authored by JA Proger
Intro
VolBack?
What's it?
I started to think about potential sum of volumes of everyday backups.
Backup is a full copy of the system for a unit of time (UT).
We know that this is of the most important backend parts of any computer system.
We know that backups have weaknesses... There's only one — duplication. Funny thing is that duplication in the case of backups is essential.
Math section
Imagine we have a CRM, which has a lifetime of 3 days.
We need to backup it each day.
- Day 1. We added 100 mb
- Day 2. We added 50 mb
- Day 3. We added 30 mb
What does it mean?
- Backup for day 1: 100 mb
- Backup for day 2: 100 mb + 50 mb =150 MB
- Backup for day 3: 150 mb + 30 mb =180 MB
Nice!
So the total backup volume will be: 100 mb + 150 mb + 180 mb =430 MB.
To handle this calculations I find a mathematical formula for this process.
Sn=n⋅x1+∑i=1n−1(n−i)∗ai S_n = n \cdot x_1 + \sum_{i=1}^{n-1} (n - i) * a_i Sn=n⋅x1+∑i=1n−1(n−i)∗ai
Where:
- n: quantity of UT (second, hour, day, etc)
- x1x_1 x1 : initial value of volume at first UT
- a: array of a values (additions in volume at each IT)
Development
I will expand this method in case when we don't now additions' values.
Watch the repository https://github.com/ja-proger/VolBack. Now available on Swift
Write down any ideas in the comments below!
This content originally appeared on DEV Community and was authored by JA Proger
JA Proger | Sciencx (2025-11-22T19:03:35+00:00) VolBack : Backup tool. Retrieved from https://www.scien.cx/2025/11/22/volback-backup-tool/
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