hunter5 wrote:The reason for planetary bases is to house ground forces and give a place for the ships' crews to rest off the ship as well as do ship maintenance you can't do in the field.
The problem is that a planetary base represents a dangerously fixed target the enemy can hit at any time.
In classic guerrilla operations you run this same problem. Build an elaborate fixed base, the enemy comes in and destroys it. If the enemy is the government and can always bring superior concentrations of force, the primary goal is to preserve your forces as a force in being since getting destroyed means you're no longer a threat. Because the government can't be strong everywhere, you pick your best places to attack and strike there. Guerrilla forces don't tend to operate as standing armies or operate in fixed formations. You don't see guerrilla tanks, a guerrilla air force, etc. Things can get rather interesting when external support is provided by a third party with a vested interest in seeing the government fail.
If we're talking about a galactic-scale war, we're looking at amateur rebels gradually becoming a professional military. They're no longer operating as guerrillas but as forces equal in might and stature to the government's. That evolution of scale was visible between the three movies.
If the rebels can defend a planetary system against the best attack the Imperials can muster, they can afford to have a planetary base. If they cannot, then it is a target simply waiting to be destroyed.
As far as Earth examples go, a guerrilla navy would need land bases to operate from and an extensive supply line. That's why we tend not to see many examples of such. You can't get around the need for land bases. But Star Wars has many examples of mobile starbases. There's no need to have a planetary base. Supplies can be routed to the fleet from sympathizers throughout the galaxy. The particular need for drydocks and shipyards of a wet navy don't exactly translate to space. Yes, ships will need to be maintained but much of that infrastructure could conceivably be made mobile to travel with the fleet.
The Macross series of anime liked to run with the idea of an entire technological civilization self-contained within a fleet of colony ships. They can repair the existing ships and build new ones from asteroid material.
The danger for the imperials in this situation is trying to suppress the rebellion without creating more sympathy. Recruits are drawn from planets, obviously. And logistical support is likewise going out to the rebel fleet. But how do you prove guilt, how do you break the support ties without killing a bunch of people and radicalizing the survivors? It's the whole squeezing fingers/systems slipping through problem.