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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-
On 1 so you mean copy specific files that relate to what I've put in place once the OS is installed?
Yup. You might be running an old version of motioneyeos right now but that probably isn't important to you. If the Pi explodes and you replace it you might as well instlal the latest, greatest and get things working with that. For that you need your script etc.
I have a Pi that amongst other things is my UniFi controller. I can reinstall the controller software so I just keep a copy of the settings backup file produced by it. It is also a TV headend tuner for which I backup nothing because I could just reinstall it.
On storage would you be sad if you lost data when a drive fails? If it is full of CD rips you could rip again perhaps not. If it has photos you can't recreate then probably.
RAID 0 will give you one big disk and all the drive space you buy but no redundancy. 2x 4TB drives = 8TB of storage.
With a pair of drives and RAID 1 you can have a drive fail and still keep all your data it is written to both drives. 2x 4TB drives = 4TB of storage.
RAID 5 does cunning things with parity data to allow you to use more data. 3x 4TB drives = 8TB of storage.
Of course you should still have offsite backups for really important stuff for when your home is eaten by an enormous, destructive, prehistoric sea monster awakened and empowered by nuclear radiation.
jellybaby
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.