You just need to have access to a console/terminal on the same grid.
to save a iar: "save iar name surname / password /path/whatevername.iar" in this case you would save your entire inventory (/) if uyou want to save a specific folder of your inventory just replace the "/" by the name of the folder for example "/Objects" or "/Scripts/my scripts" have in consideration it's case sensitive.
You don't even need to be on line to save the IAR.
On the OAR: just have your console with the region active and "save oar /path/nameofoar.oar" this is easier and faster.
Either case you need to have access to the console, if you're renting just a sim in those grids that won't let you access the console, then you won't be able to save the iars and oars yourself unless the grid owners provides some web interface for it's users.
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