Are the savestates of the different systems always stored in the rom folder?

For RetroArch based emulators, yes. Other standalone emulators may choose to save to different locations, depending on their implementation and it's not always in the system's folder (e.g. Mupen64plus, PPSSPP, etc).

How about dos games, are the savegames always in the folder of the respective game?

Most likely yes, by default the game folder is set-up in Dosbox as C: driver by default, so saves should go there.
If you're using a different set-up to start the games (using .conf file and/or a separate folder for PC games), then this may vary.

I'm not that big of a shell expert, the only thing that comes to mind right away is to copy the savegames and states by hand before mirroring them again so that they don't get lost. Does anyone have a more elegant way that is easy to do?

Use a NAS to share the ROM folders between the 2 systems ?
You can also use the roms share from one of the Pis as the network share for the 2nd Pi, using the same guide referenced above.

@joelkolb Wow! Thanks for the really detailed explanation!

@nemo93 said in [Solved] "Ecstatica" - issues with saving games in DosBox:

@AdamBeGood You don't have apologize or be sorry for anything. Asking questions and seeking for help is what this forum is there for :-)

Under DOSbox, swapping discs around is not clearly indicated as you experienced yourself! Yet it does work flawless. Let me share a quick hint as well that could come in handy.

Some games do support natively multiple CDROM drives. Meaning you can mount the different "isos" images and assign these to different drives letters. As you mentioned Command & Conquer let's use this as an example below. Just add something like that in your [autoexec] section:

[autoexec] imgmount d /home/pi/RetroPie/roms/pc/isos/comcon/CaCCD1.iso -t cdrom imgmount e /home/pi/RetroPie/roms/pc/isos/comcon/CaCCD2.iso -t cdrom mount c /home/pi/RetroPie/roms/pc/games C: CD COMCON C&C.EXE EXIT

Then no more disc swapping in-game :-) Other games where this is working which I've tested: Under a Killing Moon, Ripper (6 discs!!), Pandora Directive. I haven't tried with the Wing Commander serie so feel free to report back if you have some success!!

Interesting! And I guess that would work with three disks to accommodate Covert Operations also? Great tip!

Thanks again!

Edit - that didn't seem to work for me actually with Covert Ops.. but it may be something I am doing wrong here. That is quite likely. Everything works perfectly so I won't push my luck!

again.... playstation games..... and the snes9x2010 emulator lol i figured i wouldnt find a answer on here im pretty sure the official power supply is enough

just posted a issue with re3 having load issues.... the guy wanted to know what kinda power supply i was using LMFAO outa 166 games why does the type of controller i use a issue at all.....

ok thanks, fool me i already known that video but i overlooked the save states parts!!

@meynti The backup image contains 2 partitions, one for boot and one for the system itself. The 2nd partition is formatted with the Linux ext4 filesystem and cannot be read by Windows. You'll need a Linux system to be able to read it - either try a live linux distro (that you can run from an USB drive on your Windows PC) or find a Linux installed pc to read the image.

@simonster Only with Keyboard' :( damn