.v2i - Base or Full Backup recovery point image. This can be created from the Full backup of a Recovery Point Set or by running an Independent Backup.

.iv2i - Incremental image. An incremental backup includes the changes to the drive since the last backup (incremental or base) was performed.

.sv2i - System Index File.    Each time a backup image is created, a system index file is saved along with it.  The system index file contains a list of the most recent recovery points, which includes the original drive location of each recovery point.  The system index file (.sv2i) is created when a backup operation is performed that has multiple drives or a recovery point set (base and incremental backups). A system index file reduces the amount of time that is needed to restore the computer as it allows the restore of all backed up drives.

.fbf - Files and Folder Backups

• For example:  if you create a Base backup on the first of each month and incrementals once per week, you will have 5 backup images (one base and 4 incrementals) at the end of the month. All 5 of these images comprise one recovery point set.

Recovery Point Set Example:

By default, scheduled independent recovery point file names and recovery point set file names are appended with 001.v2i, 002.v2i, and so forth.

Incremental recovery point file names within a set are appended with _i001.iv2i, _i002.iv2i, and so forth. For example, if your base recovery point is called Server_001.v2i, the first incremental recovery point is called Server_001_i001.iv2i.