Reverse incremental (slower)
Increments are injected into the full backup file. so that the latest backup file is always a full backup of the most recent VM state.
Incremental (recommended)
Increments are saved into new files dependent on previous files in the chain. Best for backup tragets with poor random I/O performance
Create synthetic full backups periodically
Transform previous backup chains into rollbacks
Converts previous incremental backup chain into rollbacks for the newly created full backup file.