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You will have to collect the data by running tools such as sar/vmstat/glance from crontab.
Check out sa1, sa2, sadc - system activity report package regarding sar.

As for glance i have found this...

Learn Backup and Restore to Disaster Recovery level. This is the first and most important responsibility of the Systems Administrator.
Practice, rehearse, be confident and competent.

You need a machine you can play with... If you dont have that at work, try to find one second hand... I suppose an old D class would be dead cheap... because there is differences between daily job,...

Most of your questions/time/frustration will relate to everyday questions that you have to use complex commands or small scripts to answer.

Learn the base command set really well (e.g., tar and so...