wasc wrote:For example I assume a Daily forward incremental backup job which has the 'Create synthetic full backups periodically' checked would benefit from REFS, but what if the same job had 'Create active full backups periodically' instead of 'synthetic full'???
Would they both create a full backup that is spaceless and created quicker?
No, Fast Clone is used during synthetic operations.
wasc wrote:Am I correct in saying as well that reverse incremental jobs benefit from REFS but only to reduce IO and not to reduce disk space (since all the blocks fast clone is moving out of the VBK are being replaced with new blocks)?
Reverse incremental is already the most efficient in terms of space usage, since the chain consists of a single full + increments. That said, new full backup file created during compact operation does not require extra space in case of reverse incremental as well.