How redundant are SSDs actually? I've been doing offline backups, but the OCD kicks in and I start wondering how many I should actually have and how often I should replace them...
I think the general consensus is that you shouldn't just leave them on a shelf for more than a year and that there is some temperature dependency in there.
If you really care about the data, two+ backups stored in different places is completely reasonable. Note that "places" is not limited by physical as trying to maintain independent dependency chains (e.g. a durable storage provider may decide to cut off account access so maybe a second independent storage provider using a different credit card makes sense)
Your OCD may also be helped a bit by having some way to verify you backups (e.g. use ZFS and scrub regularly and/or separate hash manifests of the files).
