ARCHIVELOG space consumption

I am new to DBA world and would like to ask how much space is consumed when ORA XE database is in archivelog mode. That is if XE is limited to 5 GB of data how much of that space is ment to be for archivelog segment. Furthermore what exactly(besides DATA) is consuming those 5 GB of available space(db objects, data, ???)?
Thank you in advance,

Thank you C.
I wasn't sure weather files for archivelog were part of those 5 GB DATA space. I was thinking that if you have lets say 2 of 5 GB of space consumed and last backup was made when there was only 1 GB of data in DB that actual consumption is 3 GB(2GB for data and 1 GB for archive log). Thank you once again for clarification.

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