a$.$ ABC company$$s data administrator decided to take cumulative incremental backup of storage on weekly basis on every Wednesday night at $2$:$00$ am$.$ The full backup of the storage system is taken in every two months. As per data administrator, if failure occurs then it takes $24$ hrs to recover the system $($without storage space saving methods$)$ to its last backup state.

i$.$ What is the RPO and RTO for the system?

ii$.$ The weekly backups and full backups occupy lots of storage space. Which of the following methods you will suggest to the data administrator for saving storage space? Argue. State your assumptions clearly, if any.

$1.$ File level Deduplication

$2.$ Fixed length block level deduplication

$3.$ Variable block length deduplication