Seems you are doing just fine
Btw you can start using tab for auto completion. Try typing 'D' then press tab , it will give you Document and Download. To close down on the Download , add ow. So now you have 'Dow' and no other directories share the name starting with Download so bash will give you Download.
Also after you have untar , you are not sure what happened. Try ls again. In fact , try to do ls every now and then. Linux or Unix rule is 'No news is good news' so if you are not seeing anything , it probably means whatever you did went right.
As for CrashPlan , I can't help with that since I have never used it before. But why not give it your backup directory?