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1) I think what atk and I are suggesting is plan to rebuild if a Pi fails. Just back up your data (whatever that is).
You don't need a local copy of your word processor, you do need a copy of the novel you are working on.
2) I have one DS420j with 3 drives in it. The drives are the expensive part IIRC.
The 'calculator' is worth a play with to get an idea of options for number of drives and data redundancy in any NAS. https://www.synology.com/en-uk/support/RAID_calculator
The RAID options are standard, SHR1/2 are Synology specific.
You can get 1 and 2 bay NAS systems. which are cheaper but might not have enough slots for your desired data redundancy.
jellybaby-
Thanks again.
On 1 so you mean copy specific files that relate to what I've put in place once the OS is installed? E.g. on motioneyeos I've created a script that then allows me to monitor the processor temperature via the camera image preview. (Bad example really as this is v.simple to recreate if needed).
There's lots of little details but I guess all would be small jobs to recreate if 1 card corrupts - it'd be bad luck for multiple to fail at same time I guess?
On 2 - this is where I read and sort of understand the principle, but the detail is like a different language. The calculator drop down options mean nothing to me. More reading for me to do I guess.
Desired data redundancy = no. of copies incase they start failing?
rhb
(Remember my claxon earlier)
1) is what your describing restore or rebuild in terms of what atk asked?
2) cool, this is useful thanks. Where can I reliably better learn about these? Googling the DS420j suggests this'd be huge overkill here. When you say you have 3 drives, is that 3 of the DS420j's - my budget wouldn't cover that kind of spend. I appreciate I'll get what I pay for / buy cheap buy twice etc.