Regarding the fetch missions - how did you get past the security on the Hab buildings? Is there a trick to it?
(Many Habs require only 0 to enter, but the datapoint is usually behind a Sec 1 at least)
If you're not a murder hobo like me, your options are more limited but they're still good.
First off, HABs with no restrictions are great, just walk right in and take what you can get away with.
The other places to look are unrestricted zones that are accessed locked. You can enter those and hang around as long as you want, the trick is to bypass the doors. Often workers will walk through those doors as part of their routine, all you have to do is find one and wait. Another trick is a patrolling guard. If they have the authority to open the door all you have to do is get them close enough. Which means just loiter at the door and if one gets close enough to want to scan you, they'll come to you and open the door for you. Just wait for the scan to complete.
Restricted zones are problematic because if someone sees you there they will raise the alarm but if you're quick and no one's around you can just dive in, mark what you want to dl and wait outside the restricted area for the dl to complete. Remember you get one free pass to get out of a restricted zone.