This article applies to:
All EaseUS Todo Backup editions
Please bear in mind the following notes when creating a backup strategy.
1. Each backup produces a separate backup file.
2. Basic knowledge difference between Full, incremental and dfiferential backup file is required for understanding this article.
3. Your backup storage will need to be at least twice the size of a full backup. Or even larger than that.
You could imagine that after many schedule backup cycles, no matter how large the target storage is, the backup files will fill up all the available space. EaseUS has a Backup File Retention feature that will retain the latest 1 or 2 cycles of backup files and remove others to ensure there always has enough space for the new files. Backup files are retained/deleted using a rule described below.
This feature is not available in SQL backup module.
How to enable and configure the rules
When creating a new backup/schedule, the rule configuration page will appear after clicking the hyper link Image-reserve strategy/Backup Cleanup.
Home & Free edition:
List of sceenshot numbered items:
1. Turn on/off image retention rule for current backup.
2. Delete old backup files based on a certain period or numbers of files. In the time option you can retain files for days, weeks or years.
3. By ticking this option, the first full image backup file will be retained permanently and not deleted by any of the selected rules.
4. Tick this option, to merge old images instead of deleting them.
It is also allowed to add a rule for the created schedules. Details are given in the figure below:
Home & Free edition:
How the rule works
There are two rules which control how backup files are retained and/or deleted.
1. A full backup file will only be deleted when its related incremental/differential files are all deleted.
2. To retain X versions/days' image file means there should be at least X versions/days' image files recoverable. So it is normal that the actually retained backup files are greater than the specified number X.
Example: The diagram below shows the sequence of backup file retention/deletion when selecting “no more than 3 days”.
1. On day 4, EaseUS Todo Backup creates a new full image file to start a new cycle.
2. On day 5, the incremental schedule creates a new incremental file. However, EaseUS Todo Backup doesn’t delete any backup files on that day because if removing the first cycle of full + incremental backup files, there will be only 2 available image files left.
While for differential schedule, first differential backup file is removed because of the difference between the two kind of schedules. Incremental backup file is based on all previous image files in the same circle, while differential only has connection to the full image file.
3. On day 6, when the available backup files rises to three, the first set can be completely removed for both schedule type.
4. On day 7, the number of files will appear as they did on day 4.