When backing up by using AIP Linux Edition, COW file [.datto] is created in the respective volumes.
Briefly, after taking a snapshot, the changes are temporarily saved in this file.
Therefore, please do not delete the file.
Full backup：10% of the backup source volume
Incremental backup：0.2% of the backup source volume
Upon completion of full backup task, COW file is used for incremental backup.
This COW file is excluded when executing backup task in order not to back up unwanted data.
– ActiveImage Protector 2018/2022 Linux