You are a stranded time traveler on a mission to retreive 100 Terabytes of important historical information to save the future; How would you get this data intact into 100 years in the future?

Release the data on the public internet in an encrypted form. With the data, include a message openly admitting you're a time traveler. Include predictions of events that are relatively resistant to the butterfly effect and will have little effect on the time stream. For example, I would include a long list of future supernovae and other astrophysical phenomena. Such data would accelerate the field of astronomy a bit, but it wouldn't really affect life on Earth much. And it would prove that you're either a time traveler or someone with access to FTL travel technology. In your message, tell people the data is of vital importance to the future of humanity and that it will be needed in a crucial hour.
There will be enough people who preserve a copy of the data and pass it along to their children and grandchildren. Forget relying on technical solutions. This is one you can rely on people for. Unless there's some complete collapse of technological society, the data will be preserved.

Store it optically in a single fused quartz crystal that is available today, then get that crystal put into an exoplanet lander going : Venus, Mercury or perhaps large moons like Titan or the Jovian moons.
We have a the technology today to send stuff to these far off places, but no ability to bring it back. In 100 years time there likely would be the technology. So even if "the enemy" knew I sent it to Titan and knew exactly where it was, they couldn't read it.

Print it out at work and leave it on the printer.

Write whole 100TB of 0s and 1s into clay tablets. I might need some help with logistics

Nice try, enemy time travel team checking the fediverse archives a hundred years from now.
- This Is How You Lose The Time War
  
  I was both happy and disappointed in reading that novella. Its long on prose, but short on story. For those that like that, its probably fantastic. Its not quite my cup of tea though.
- Damn, almost fooled you. 😅
  Just give up already, your team is on the wrong side of the space-time war.
  Just give up the location of the archive, and we might consider letting you go. 😉

Setup a company who's job it is to maintain the data. They make money by offering the same services to others, but their main aim is the preservation of this 100TB. Only people passing stringent security checks will know of this special mission. Enemies from the future will be scared away by a sign on the door reading "BEWARE OF THE TIGER".
They will run massive NetApp arrays and redundant ZFS pools. They will rotate disks out periodically and migrate onto newer technologies as and when. Backups will be taken, verified and tested monthly. Basically it's Backblaze but running for 100 years.
- Enemies from the future will be scared away by a sign on the door reading “BEWARE OF THE TIGER”.
  🤣
  Perfection
- BEWARE OF THE ~~TIGER~~ LEOPARD

10 encrypted mdisc addressed to the good guys buried in as many 100year time capsules as possible.
alternatively just give it to the time traveller sent to retrieve you.
alternatively the future needs this data because you failed and you need to accept this is how things always happen.

Oh sure - I tell you, you tell somebody else, next thing every time traveller is doing it.

Create a torrent file named RockyHorrorPictureShow_Outtakes_TaylorSwift and release it to the internet.

My first thought went to those M-Disk/BDXL bluray disks which supposed to last 1000 years if you believe the claims. So with 100gb per disk you would need atleast 1000 disks. Probably more since the data probably wont perfectly fill out each disk. Writing to optical media is slow and according to the very first searchresult i found it takes upwards of 3hrs to write and verify a single disk. So with a single drive it would take atleast north of 3000 hours if nothing goes wrong. A year has ~8760 hours btw. Oh boi.
But i wouldnt want to rely on a single copy of each disk. If the data is so important i would like to have atleast 10 copies? So the year would probably consist of only maintaining and repairing several burning rigs and going through like ~~35.000~~ edit: 11.000 blurays and then finding spots to safely store them.
But how will they read the data of the disks in the future? Blurays and todays data formats most likely wont exist anymore. So you would need several redundant PCs with bluray drives which hopefully last that long. The HDD/SSD wont last in them. Linux live disks burned on the blurays? On top foolproof documentation how to operate all that ancient shit.
My head hurts
- Seems like it would be feasible to purchase a few hundred of those drives and then store them in vacuum sealed containers all over the place.
  I believe that worst case after 100 years, the worst that future data restorationists would have to do is replace some rubber belts, Maybe rework a connector or two.
- But how will they read the data of the disks in the future?
  I would hope a team fighting a time war would have some skills here. I don't have to solve that problem.
- The discs actually last several hundred years.

LTO9 tapes with LTFS
- Laster than fight speeds
  
  maybe not super fast but durable and will stand the test of time and be readable with a usable technology in a 100 years

I set up like a million dead drops, craigslist entries and graffitti telling the other time travellers to come pick me up where I am. As long as one makes it I will get an instant pickup materializing next to me instantly and can carry whatever server rack I'm salvaging inside their DeLorean or TARDIS or whatever. Bonus points, I get to survive. Extra bonus points, let's go to the place the other guys jumped me and bootstrap their asses into the curb.
I get that the idea is chatting about how to preserve data, but time travel breaks every premise if you think about it for two minutes.
- What if the enemy time travelers get to you first?
  
  There is no first. Time travel! Just keep going back. Hell, screw telling my future friends about coming to pick me up, tell them to tell me where I got jumped so I can avoid it and I don't even have to be here in the first place.
  I will Primer the crap out of this situation if there are time machines. I will Primer the crap out of every situation if you let me have a time machine.

100 years ain't that long tbh. Seal it in a glass jar and put it somewhere cool and dry, like a cave, and it'll be fine.

Claim it's some secret govt data, then all the conspiracy theorists will archive it. Especially after misterously dying onr year later!

Easy. Copy the data into several different mediums and store them as safely as I can. Bury half of them in time capsules set to be dug up in 100 years and then start a cult based around duplicating and passing the data down through the generations. Hopefully one of those two methods insures that at least one whole copy of the 100tb of data survives the 100 years.
- 1: most mediums will not last close to a hundred years
  2: writing 100tb takes a lot of time.
  
  Eh. I've moved 2/3 TB around for work a few times. Yeah it's slow but transfer speeds have only been getting better. I figure in 100 years transferring 1tb will take about as long as it takes us to transfer 1gb these days. If not even better.

Does it only need to be discovered by the people 100 years in the future, or can people before that be aware of it?
Because this reminds me of the nuclear waste protection research. You found a religion that fears glowing cats....
- It has to be 100 years, becuase the idea of sending a time traveler in the past is conceived in 100 years, so they wouldn't be looking for the data before then.
  Once they come up with the idea of the mission to send someone to the past, they also realize: "Hmm what if the mission has already been done?" and so they immediately send a team to search for possible clues on where the data is, if someone alredy went to the past and weren't able to return.
  If its gets found in like 99 years, the enemy forces could get their hands on it before your teams starts looking for it.
  Basically, in exactly 100 years, the idea of sending someone to the past is thought of, then some time after that, say, in year 120, they finish the time machine. They would be looking for the data in year 100, 20 years before the time machine has even been built. Get it? They would never think of looking for the data before 100 years since they haven't thought about the time machine idea.
  
  Okay yeah that makes sense. So that rules out founding cults that use the information as their holy book. But it could allow for "keep it secret, keep it safe" cults where there's a holy object that they know is important but don't know contains the data. (But it can't be SO interesting that people try to inspect and understand it and inadvertently discover the data).
  I wonder if you could rely on your buddy in the future knowing what your favorite password is and encrypting the data somehow.
  Does it need to be discovered ASAP in that 20 year gap or can it be later on in that period once they know that you specifically are selected for the mission?

Some type of data crystal/diamond sneak it in to or on to a piece of art or jewelry in a museum somehow or maybe stash it in a statue or graveyard someplace that’ll persist and most likely won’t be changed much if at all for that amount of time. The organization that sent me on this mission surely had a dead drop contingency plan they have time traveling tech. Or I leave a clue carved in stone on the grounds of the one day HQ hoping they get the clue and can swap the data crystal out later. 🤷‍♂️

How experimental are we going? There's some cool research into laser etching data into crystal cubes. That should be very stable, but I don't know how you'd get to the tech.
https://wikipedia.org/wiki/5D_optical_data_storage
- I don’t know how you’d get to the tech.
  Steal it from the enemy time travelers, obviously. 😁

Break it into overlapping chunks, encode it as nucleic acid base pairs, and splice it into the genomes of a bunch of soil bacteria.

Putting a comment here to commemorate when I initially interacted with the time travellers.

What medium is the data already on?
- Its one hundred of 1TB MicroSD Cards, better back it up before it gets corrupted! Good luck, time traveler! 😉
  
  I've just decided that the future isn't worth it and I'm throwing all of them in the ocean.

"Back to the Future, Part 2" tells me law firms will hold and deliver things.
Easy enough for future time travelers to protect data from themselves until certain dates.
Enemy time travelers? Gotta keep the "how", "where" and "when" quiet forever. Keeping it boring will keep it from being repeated.

Use lasers to create bubbles in large chunks of glass. Duplicate a few times on a few far flung continents, including Arctic/Antarctica.

As a time traveler I expect to have knowledge of what readers exists. verbatim makes archival grade DVD, blu-ray, and CD media guaranteed to last 100 years. Put copies on a couple different time capsules and I'm good. However I don't have much confidence that media readers for any of this will exist. Even if I put a reader in the time capsule I'm not confident it will survive - the media will be good but the mechanics probably are lost to corrosion, so this is the most important part.
Does it really need to be all 100tb? Can I find a small subset that matters? We have history of payrus scrolls with the correct ink that have a proven history of lasting thousands of years when left in a desert garbage dump. You can find the recipe for making both the scrolls and the ink in the bible. Copy by hand, leave in the desert, in a location I know archeologists will dig in 100 years. This is very limited amounts of data that can be saved though.
If the above doesn't work, non-acid paper when laser printed (not inkjet!) should last plenty long. Again I don't think I can get anywhere near your 100tb, but I remain convinced everything we need can be archived on it.

I guess it depends on what sort of data is in this 100 TB data set. And if I have any other tools at my disposal to transcribe the data into new mediums or any time adjacent knowledge for things that would happen in the next year.
If there was an accurate almanac, lunar calendar of events or current world/local history. Establishing myself as some sort of prophet, messiah or divine messenger should be possible. Once I establish that I can see the future, then I need to make a far flung prediction for my home time that "will be revealed when the time is right".
Four important rules would needed to make it work.
Primarily a foundational tennat not to alter my prophecy. I am the one and only prophet that will ever exist. Of course schisms and reformations will likely occur but so long as the "orthodox" faithful preserve my original writings it should stand the test of time.
Secondly, depending on how my death occurs in "exactly one year", I can work that in to the cannon as being recalled to the higher plane. Especially if this time death is flashy! Hopefully something like my body being ripped apart by the time stream. Nice big event that will be remembered.
Thirdly, I protect my religious with good ole fashion reliable xenophobia! Whatever tools I can use to identify competing time travelers will be the sign of heretics and evil demons.
Finally, that my tomb is to contain both my original manuscripts that are never to be touched or altered. And importantly, exact prophecies that are supposed to be opened prior to various major world events. If I can sprinkle a good one every 20 years or so then the faith should remain strong.

Important question. Is this a 1 traveler vs multiple travelers situation or can I have teammates as well?
You know what? I don't even need teammates. I'm going to start a HUGE mass awareness campaign (it will be on the news, uploaded as a torrent on everywhere, etc.) for people to selfhost this data on their system and compensating them automatically by a script system with a fuck ton of money. The script will check if the data is still is in it's original state every month, and if it is then those selfhosters will get a lot of cash as a compensation. Ofc this script checking system will run on a bunch of different servers, like on thousands of raspberry pi 473883 chips located all over the world, so the time travellers won't find all of these verification systems in time.
- You only have yourself on your team.
  There could be like anywhere from 1 to 20 enemy time travelers. Don't worry tho, they all die in 1 year (just like you do) due to the constraints of the time travel.
  The point is: You can't just publically draw attention to yourself and post the location of the data to make it easier for the future to find it, because I know someone is gonna be like "Just run for elected office and store it in the government archives". I wanna make the question more challenging.

Based on the past, it seems vinyl records are near indestructible. So, embedding the data in that somehow and keeping it cool might work.
Printed might also work but it's a lot of data. Microfiche maybe?
Another option might be to use some form of nuclear battery to keep a bunch of multi TB SSDs powered up.
- Another option might be to use some form of nuclear battery to keep a bunch of multi TB SSDs powered up.
  That radiation is gonna flip a lot of bits in the SSDs
  
  Separate the compartments with lead then?

Nice try enemy time traveler!