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would be very interested if you could elaborate and share how you got it all set up. I am also interested in doing an rsync sorta thing just for config files and such (no roms or hard disk/floppy images). You run syncthing on the mister itself? if so which arm binary did you use and how did you configure it since it seems to want to use a web addr on localhost.
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It's also very important for the time be accurate on every system else the files can be overwritten by older versions. I only use syncthing to sync settings, saves, and savestates between my NAS, two mister handhelds, and console setup. Roms don't change very often and I typically use FreeFileSync to sync the roms. I also don't use it to sync roms as it can take hours just to scan everything to look for changes let alone transfer them. I find it can affect performance of the linux side of things and strange things can happen. I typically start syncthing under a script custom as needed. I do have a NAS which is already running SyncThing so will investigate SMB/CIFS suggestion instead. Thanks for the suggestion, I think, as you pointed out, the strain on the SD card might be too much.
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SMB/CIFS support is great, if you have a NAS maybe consider running SyncThing on that? SD wear aside SyncThing is relatively resource intensive for a little dual core 800MHz Cortex-A9. Hey power to you for trying these things out, it just seems like a very roundabout way of doing it.
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Of course, it could also end up as one big mess, long as I have a robust enough backup of my SD card then there is no real danger. Being able to seamlessly sync all my ROMS, HDF files and and save states across multiple platforms to use on either other Misters or emulators on phones, tablets, laptops, PCs seems worth trying. I agree that adding services may add to stability issues but I also think there is merit in using this particular sync software over Gdrive and Rclone.
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I know there are scripts to allow you to sync saves with Google Drive or RClone anywhere you like, have you considered using those instead? Adding another service running in the background is asking for trouble imho. MiSTer isn't really meant to be used this way the linux configuration is purposefully lean and the filesystem is intended to be largely read-only. That doesn't sound like the best of ideas.
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