@Maximilian-Gerhardt I agree on your idea for laying this out. USB for the disk, the built-in µSD card slot for the µSD card. Add some LEds, buttons, and/or expansion boards for a physical user interface if you want one.
USB 2.0 will be limited to ~60 megabytes per second, but that might be fast enough for many uses, like if you just want to leave the µSD card in this auto-backup-dock-thing whenever it's not in use. If you want more speed, it's probably time to use a more powerful device with USB 3.0 or native SATA. That might be an old laptop, or a faster single-board computer (some have USB 3.0).
As to software, I bet this will be possible using some combination of scripts or programs that do the actual sync, and something to start it when a new card is inserted, probably procd. For copying, I'd consider rsync, as I bet there's some combination of flags that will make sure that your data only gets copied off once, not multiple copies of the same data.
Assuming you want to delete the files off of the uSD card once they're copied, you could mount the µSD card once as "read-only", copy the data off, then remount it as "read-write" for just a few seconds to delete the files, then unmount. This is pretty safe, as you can safely yank the µSD card out at any point in time except during that time when it's mounted "read-write".
but i mean logically swapon should be part of swap_utils right? i mean that would make sense
Sure, it would. It's not the Onion-devs who decided to place it in block-mount, though -- the decision is made upstream.
secondly dunno my microsd keeps becoming un accessible, i actually think its random and not associated with the command error, however it was still under the temp directory as i wasn't mounting it on startup - maybe that was the issue
Maybe you could try with another card? Perhaps the one you're trying is bad or doesn't sit entirely properly in the slot. Or, perhaps mountd (the application that handles automatic mounting of stuff) is buggy -- have you tried manually mounting it? Something like e.g. mount /dev/mmcblk0p1 /where/you/want/it/mounted -o noatime -t ext4 should work. Personally, I don't like the automount-thingamabob.
i really appreciate your response, i think because its in such an early stage and im inexperienced i struggle to tell if i am doing somehting incorrect or its broken, so knowing you have it going helps alot