Rsync re-copying all files
If you change your command to start rsync -rvh ... to rsync -avh ... you should have more success.

The way you have the command just now rsync isn't copying over date stamps. The files in MobArchive will have their Create, Modify and Access times set to the time they are created in MobArchive. So every time rsync does a compare the date stamps in Archive and MobArchive will not match and it'll copy over everything again.

The "a" option (aka "archive" mode) is the equivalent of "-rlptgoD" which does a number of things including preserving timestamps.