Our journaling is sporadic at best!

But we do it to the best of our abilities, usually we mainly do it when it's noisy inside or a lot of people what to say something at once or something like that. It's a lot easier to say "You have to wait you turn to write" than it is to say "You have to wait your turn to talk", because we can only share one hand (the body's right-handed, and despite others being left-handed, the body's not used to writing with the left hand so despite best efforts it's just easier to be/stay right-handed, at least for now), so it sorta helps force us to take turns.
Depending on how quickly we need to record stuff (like, if lots of alters have something to say, or if it's noisy inside, or if we just feel like we need to get something out of our system right now), we type it out and save it EVERYWHERE. We save copies like none other because we're so afraid of losing stuff we write. We save it to our Documents, we save copies on a USB if we can manage it, and we usually email stuff to ourselves so that it's saved in our email, too. And we type because we're much faster typers (at least, most of us are) than we are writers, and if needed older alters can always help younger alters type so that everyone's able to type just as fast/well as the next.
If we're writing notes to each other, or a couple alters have something to say, or someone just needs to vent, we usually tend to write. And we usually share one journal, but we have like, millions of them to choose from to share. It usually depends on which journal we can find first and which one we feel like writing in at the time. We try to date each entry, though, to help us keep things and timelines straight.
When we share a journal, depending on what's going on and what the topic is and who's out and such, it can either be clear messages/notes back and forth to each other, or it could be an entry from someone with a reply from another, or it could be jumbled mush that's rapidly changing handwriting, pen colors, and is full of quick switches. Usually, it's not jumbled to us, and we tend to retype out ones that are hard to read via handwriting so that we have a clearer, easier-to-read copy as well as the original writing.
Some alters do have their own journals, though. Luna got one for Christmas that's only her's. Shay has one that we sometimes share, but it's mainly just her's. With our own journals, though, usually the only one to write in it is the owner of the journal, unless the owner says otherwise. So, no one will write in Luna's journal unless she says it's ok or asks someone to read/reply to something, or something like that.
Another thing that's worked for us in the past instead of journals is tape recording, because talking is faster than writing or typing. We didn't do it much because switching and stuff wasn't as easy or smooth for us back then, but we have one or two cassette tapes still with different "entries" and such on them. What we would do is we'd get our cassette tape recorder and a blank tape whenever we had something we wanted to talk about, rant about, or just to record a conversation with ourselves even, and then we'd record whenever we wanted until the tape was used up, then we'd label it and store it in a safe place, and listen to it whenever we wanted. That could be an option to think about as well.
-Cassandra