u/Clawkikker

I want to have a set of backup drives for important info that I can keep offline, but am not sure of the best way to make sure they stay good. I was thinking of maybe using zfs due to built in checksum but wanted them to be accessible in windows so that was no longer an option.

I was thinking of using freefilesync to make sure they are both equal, but that doesn't cover the issue of if one copy is incorrect, so I was thinking to also create a checksum of all the files and would be abke to use that to check for correctness on a conflict. The only problem with this is that I would then need to maintain a correct list of hashes else I woukd have to rehash them every time which would be slow for large changes or have to manually add ned hashes and remove old ones.

Is there an all in one solution that exists that could do this or is it always going to be tedious to do and maintain?

I was thinking of making a cr box air purifier and was wondering what the replacement intervals would be for both MERV 13 and 14 filters. As the MERV 14 are more restrictive, I would assume they would need to be replaced more often. I am thinking of doing the two filter design like with cleanairkits and have the walls be 1in filters and sides be exhausts.

I also was considering doing a single MERV 13 filter but with a single 5in thick filter as based on some limited research it is better than two 1in MERV 13 filters and should theoretically last longer and perform better for longer although not sure how true this is. For this I was thinking of doing a straight through design or like the cleanairkit design and just have one side plugged with still side exhausts.

Is there a significant difference between one 5in filter vs 2 1in filters (both filtrete)? I am basing a design off one of the two filter designs on clean air kits and wanted to know if there is a significant drawback by only using one large filter rather than two thinner ones because of surface area and such. For the 5in design, I was thinking of having a box with one side open and still have the fans on the side rather than right in front of the filter.