We provide four metrics to help you understand the usage of a particular backup.

The mapped metric shows how much data exists within that backup. It is not the total space consumed by the backup, because the same data can be mapped to multiple backups as well as your live server. Slicie only keeps a single copy of unique data, and it does not keep duplicate copies of your data. Slicie's backup solution relies on metadata to track changes to your drives, which allows each backup to be a perfect copy of your server at the time it was taken. You may have signficantly more data mapped than you are actually using. You only pay based on your usage, not the mapped data.

The added metric shows how much data within the backup was added between this backup and the previous backup.

The modified metric shows how much data was overwritten between this backup and the previous backup.

The freed metric shows how much previously mapped data is was no longer mapped between this backup and the previous backup. You can unmap data within your storage, by causing your server to issue a "discard" IO operation. This can be accomplished with the "fstrim" command in Linux.

Data is either added, modified, or freed.