The ABC Company is considering the following options for its backup plan:

1. Daily full backups:

   • Time to perform backup = 120 minutes

   • Size of backup = 400 GB

   • Time to restore from backup = 90 minutes

2. Weekly full backups on Saturdays, plus daily incremental backups:

   • Same requirements as option 1 to make and restore the full backup on Saturday, plus

   • Time to perform daily backup = 20 minutes

   • Size of daily backup = 80 GB

   • Time to restore each daily backup file = 20 minutes plus 10 minutes to find and load each incremental file after the first one

3. Weekly full backups plus daily differential backup:

   • Same requirements as option 1 to make and restore the full backup on Saturday, plus

   • Time to perform daily backup = 20 minutes first day, growing by 25 minutes each day thereafter

   • Size of daily backup = 80 GB first day, growing by 80 GB each day

   • Time to restore differential backup file = 20 minutes first day, increasing by 20 minutes each subsequent day

   All backups (whether partial or full) must be retained for a full week. Which approach would you recommend? Why?