Kingston RAM Module - 48 GB - DDR5-5600/PC5-44800 DDR5 SDRAM - 5600 MHz Dual-rank Memory - CL46 - 1.10 V - ECC - Unbuffered - 288-pin - DIMM - KSM56E46BD8KM-48HM Shipping, arrives in 3+ days Synology D4EU01-4G 4 GB DDR4 ECC UDIMM Memory Module Add $90.12current pric...
(note: the JEDEC pdf linked in the article doesn't seem to be anymore online) So for long-term archival 'cold' backups most durable choices are DVD/BluRay media and good ol' tape (but the price for modern LTO tape systems can get easily out of the home budgets). ...