|Fascinating discussion... One could go on with this ad infintum...?|
USB flash/stick drives have a limited number of rewrites (before they go down - allegedly). They're not generally regarded as reliable long term storage (or at least that was generally the view not too long back). OK for short term - transferring from one site to another and so on - with data also secure elsewhere.
Agree the jury is out still on optical life storage time... But I feel always wise to have long term storage on two different media - even three if practical?
Minimum is two sets of optical; and thes regularly checked and replaced at intervals?
Better save copy on an external HD with one or two opticals as well. If pennies allow then use a NAS approach - with simple mirror RAID 1 arrangement at least (needs 2 HD); or if pennies allow even better go for RAID 5 which needs 3 HD. Both these latter do give better level of data security. Standard RAID 2 NAS is easy to use; increasingly familiar out there these days and ought to be no major problem for most users to get across; and not too many pennies? And again an optical set too?
On-line storage is fine... But can one be really sure that all such FACS out there are of given, highly reliable site? Server farms do go down; and the big boys who cannot afford to lose "stuff", financials etc to say the least, likely are paying a premium...?
Interesting tip about storing opticals flat rather than vertically. And of course anyone in southern hotter states usually learns fast out opticals left in a car in the summer; similar in cooler states too in summer - not forgetting us north of the border (in Canada...) where we do get summer too; not all snow up there ya know.
Fwi when there was fire at Los Alamos some years ago, some seriously secret HDs went missing, and we're later recovered.... They had all been subjected to serious heat and showed signs of muchum burning bout them. The bright boys stripped them down, respindled them etc. and recovered all data. Opticals would have been so much plastic etc. and thus all data lost... Magnetic (HD) would seem to have it overall.
Not sure how solid state HD might have fared, or how they may fair though...